tranny rebuilds cost a grip and the warranties normally arent very good either. i personally dont trust rebuilt trannies. cheapest route would to probably find a used auto tranny and sell or hope that it will last.

my auto tranny also died but i have a 94 5th gen and was spraying a 75shot for almost 2 yrs. i was gonna just slap in another used auto tranny but i figured that with the way i was spraying n2o the auto would take a shit again so i converted to stick since it would be cheaper in the long run (did the labor myself so only paid for parts).