Is there a 7th gen corolla with rwd?

No. Would require heavy modification and a lot of money.
Buy an ae86 or previous model corolla for a rwd corolla.

Edit: I'll assume you would like to have a drifter, lol, so here is an idea of other cars to get (just click on the logos). http://www.driftingstreet.com/drift-cars.html

yes

http://www.toyotanation.com/forum/showthread.php?t=233770&highlight=2jz

no its not easy, yes it is expensive.