Go to autozone. but search in every year, say 1991 thru 1993. If i search 1993, nothing shows up for the rear. but if you search 1991, you can find the jdm nx 258mm (aka maxima rear) rotors for around 14$ or something for the duralast brand. I will get those for my rear conversion. The fronts are pricey since they're vented, so most places here, O'Reilly, Autozone, Napa...will be around 45$/each. You can go rockauto, but shipping is about $15/each, so I chose to jus go to the local parts store. That's the most accurate info. It's a pain searching thru parts for these cars since its all mixed up and nothing seems to be right. Only trial and error... Good luck!
On a side note, Rock Auto seems to have vented rear 258mm & 24mm thick or something(not sure of exact thickness). I wonder if those will work....