i really need a new tranny

!!!!!!
im p!$$ed, the synchros for reverse are toast. does anyone know if it is cheaper to rebuild the tranny(could i do it myself?), or just get an old one from a autowrecker?
i cnt get it in reverse, but all of the forward gears work, so i guess ill have to drive it like it is, & shut it off, then put it in reverse until i pay back everyone, & then have eanough for a new tranny (or rebuild)
thanks
p.s. does anyone have an old t-5 laying around that you would be willing to donate to me, or sell for cheap?
------------------
1988 Mustang GT, T-5
3.08's, No Smog Pump (Shorty Belt), Dumps At The End Of Stock H-Pipe, K&N Air Filter (Stock Air Box), Removed Air Silencer
My Stang
My Site (Not Done Yet)