well you're gonna have to get a new tranny...you can't fix holes in em (unless it's a tiny pinhole...which is very unlikely...and even then it'll prolly not last)

it depends on what kind of tranny you're gonna want (LS, GSR, ITR) and how friendly you are with the mechanics (unless you're gonna do it yourself...). I'd budget like 1k-1500 parts and labor, if you go to someone who won't rip you off and you get a junkyard or used tranny...always good to budget more than you initially expect, better to have money left over than not enough money in the right place...