Consider doing it yourself. They are not hard to do if you have access to a press. The most difficult part is sliding the shafts together without any of the 120 roller bearings falling out, and there is a very easy solution to that as well. You'll need synchros for sure can't remember what I paid for the last set, I think around $15 a piece, sounds like maybe the forward input bearing $60, probably at leat on hub and the keys. The rest depends on the condition of the gears and what you are willing to live with (reverse gears are always tore up to different levels). If you want to tackle it I have some info I can send you. I also may have a 1967 M20 (larger counter shaft variety) for sale soon, fresh synchros, seals, hub, bead blasted case, ect. Think about doing it yourself, it's fun and not as difficult as you'd think.
Here are some prices I found on some reciepts I had for a few of the small parts.
Slider hub $46.00
Keys (dogs) $2.12 each 6 required
Brass synchro rings $10.95 each 4 required
Forward ball bearing $60.00
[This message has been edited by SY1 (edited 08-01-2002).]