Rotors are ~$200/each but you need pins as well and Stoptech will not sell them without the pins, so the price per rotor/pin set is ~250, and I think its $280 with the zinc plating.
Caliper seals can be done if you have significant miles/trackdays, seal kits are $50/side, I reused the pistons. IMO dont touch them unless you need to or have significant mileage/heavy use.
If you live in a really salty climate (winter road salt, or near the ocean) then get the zinc rotors. The non-plated develop rust in the floating pin "slots" and the rotors cannot properly expand, which causes the hats to crack. There is also the problem of galvanic corrosion, which weakens the aluminum hat grain structure and leads to premature failure. I went through two complete sets of rotors/hats/pins b/c of this problem, but it was before the zinc was an option.
If I were you, first pull off the old rotors/hats and inspect the hats and the area around the pins. Im my case, it was impossible to separate the hats from the rotors b/c of corrosion. If you need a complete rotors/pins/hats setup it will run you around ~$1,000. Contact Zeckhausen racing for the parts, they may even cut you a deal. I think they are Stoptech's master distributor.
EDIT: The above prices are for the 332mm rotors, add a little for the 355mm versions.
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