autozone sells calipers, $50 each side + ~$35 cores (give them back your stockies they dont know the difference).

you can get loaded ones too, which means you dont have to pay for the stupid hardware kit $35 at heavy throttle, more at the dealer. i dont know how much the loaded ones cost, but i'd almost recommend doing that and then just swapping the pads if you desire to run other than an oem replacement style.

autozone also sells rotors too $50 each side.

so for $200 (turning in your core calipers) you just have to tack on the price of lines, fluid, and new pads if you so desire. I'd most DEFINATELY recommend Speed Bleeders, best mod ever. $20 for all 4 corners.

also note, i had to stick with stock front rotors, because:
a) i have 26mm calipers, which were available on Z32 non turbo vehicles from 1989 to June of 1990 before they went to 30mm on all models. therefore, there isnt a high demand for powerslot, etc 26mm x 280mm rotors, and thus, they are highly priced.

b) i figured i'd save almost $100 and just get normal rotors, being that the Z32 front upgrade in itself is probably slight overkill for a street car, and I wasn't going to be needing the aftermarket rotors.

c) save my money now for when i upgrade to ZTuner caliper brackets in the future. Then, I'll go ahead and spend the money on some slotted 12.75" Mitsubishi 3000GT VR4 rotors (which is what you have to use with that kit).

EDIT: this is pricing for fronts only.