I am not involved in operating these or any SAMs and am only going by advertising articles and internet webpages.
Currently the Russian armed forces seem to intend to use the Pantsyr to defend their S-400s from attacks by ARMs and PGMs.
The standard vehicle, which is truck mounted (for lower costs) is best suited for defending larger SAMs because it is cheaper to buy and operate than a tracked system yet is mobile enough to move with the system it is defending.
For fixed targets an even cheaper shelterised model is an option, for an HQ, or Comms centre or an airfield for example.
To defend troops on the move the more expensive to buy and operate tracked chassis ensures it can keep up in any terrain a tank can operate in.
The system has decimetre, centimetre, and milimetre radar and IR bands to detect, track and engage targets in all sorts of EW situations day and night.
The missiles themselves have a range of 18-20km, which means that at ground level it can hit a target 20km away and at 10km altitude it can hit a target 18km away.
Regarding missiles it can engage all sorts of missiles from Tomahawks and UAVs/UCAVs, through to high speed missiles like Maverick-2 (650m/s) and HARM 2 (700m/s). It has best performance against such missiles out to 8km or so for the high speed missiles.
BTW I have found a better list of maintainence vehicles...
The 2V110-E maintainence vehicle for maintainence and repair of mechanical assemblies.
The 66R6-E repair and maintainence vehicle for maintainence and repair of electronic assemblies and units.
The 65Yu6-E alignment vehicle for alignment operations.
The 2F55-E SPTA vehicle for transportation of the groups SPTA set. (SPTA means Spare Parts, Tools and Accessories)
The 9V684-E test equipment for missile checking.
The 9F676-1 Stationary trainer and the 9F676-2 mobile trainer.
Where the stationary trainer is to train and drill 6 combat crews together in a class room type environment, while the mobile trainer is used by one crew at a time in the field.
And do you know (an assessment) how much would that cost, since 50 systems that UAE bought with command and support vehicles costed between 750-800 million$ ?
It is hard to guess. I don't think Serbia would have to pay as much as, say New Zealand would for a battery. It also matters how many batterys you want and also when. Right now they are cranking them out for UAE and for Russia, and I know for a fact that the Russian armed forces is getting them much cheaper than UAE is.
The cost to the UAE includes the cost of development as well as the purchase price... but then that is why they are getting them so soon.
It is like India with the Mig-29K, if there is a production problem and they can only make 30 more in the next 2 years they will go to India despite the Russian navy ordering some too. Simply because the Indians paid for the development of the Mig-29K so it is partially their bird.
Of course in the case of the Mig-35 they haven't paid a cent for development so if it came down to production for Russia and India then the Russians might get theirs first. Personally I think that with Sukhoi working on the T-50 and export Flankers and Su-35S for the Russian AF it is probably a very good thing there is the Mig-35 because I don't think Sukhoi alone can make enough of everything to please everyone.
Equally I would want to use the Su-35s as fighters so for short and medium strike I would want Mig-35s and Mig-29SMTs to fill that role. (Long range strike is the Su-24 and Su-34s).
Anyway back to the topic, the cost to the UAE is inflated because it includes development costs to further improve the system to what it is now.
For Serbia I think Russia could give you a better price per battery and probably some soft loans to help cover it.
If you can include it with other things like a purchase of Mig-35s and or S-300s you could probably get an even better deal.
Personally I think you should pursue one of two goals, either buy off the shelf older stuff and then upgrade it to make it effective (cheaper but less threatening to the west to keep them off your back), or gather up your dormant aerospace skills and promise and try for joint ventures with Russian companies with the goal of developing systems for countries that need to defend themselves from large powerful multinational military organisations without blowing the budget, finding low tech and high tech but cheap but also effective ways of making a powerful enemy pay for aggression. Things like the Club cruise missile in a shipping container... except design it so that it can launch from a shipping container in the water so you can sail down the coast of an enemy in a container ship and slip a few over the side to sit in the water and wait for a command to launch an attack or self destruct to destroy any evidence. Individual S-300 SAMs in single missile launchers in forests ready for launch at aircraft flying overhead. Dig them in so that they are protected from forest fires and just the end sticks out. Then make thousands of ends you can put around the place so that an external power wont know the real from the fake.
Selling it to other countries like Iran, Syria, etc will earn you lots of money hopefully and make imperialism harder for the west.
Actually what I read by now is between 14-15 million$, but I'm not sure weather it changed.
There are too many variables to give a hard figure. The Serbian ministry of defence needs to go to Rosoboronexport and say "we want 50 batteries right now and we are thinking about S-300s some time down the line too what sort of a deal can you offer us?". I think the Russians trust Serbia and respect them too as allies and would offer a good deal. Obviously the more money you can offer to put down in hard cash the better the terms I would think. Most significant deals these days include offset packages that require the vendor to invest at least 50% of the deals value in the customer countries economy anyway.