I saw complete a body 833 setups in Vegas about twice a year for decent prices. I paid $800 for mine with all the parts, shifter, linkage etc. The gearbox was in good shape, but did need bearings (seller claimed it was rebuilt, he lied - of course). The manual transmissions are very simple and easy to rebuild - highly recommend doing it yourself if you can get a box that's in good shape to start with.
The swap was relatively easy despite having to cut open the floor. My only regret has been being too cheap to replace my carpet with a properly molded 4spd kit. One of these days...