I have a 99 6spd and the synchronizers are bad... any one have a used 6spd tranny?

Bad syncros on a 99??? All of them?? WOW that's somewhat rare. You must drag race!!
The repair is really not that hard if that's all it is. Do you have the tranny opened up already??? Probably a dumb question since you already know the syncros are bad. The c5 tranny is not that heavy and disassembles VERY easily. Removing the syncros is just about removing gears then removing bad syncros then replacing the gears. One drive gear and one driven gear and a bunch of syncro rings.
Go for it. Allow one complete weekend day for the complete repair. Removal of the tranny is about 90 minutes. replacement of syncros = 2-3 hours easily. reinstallation 3-4 hours with clutch disc alignmment.

I have a 99 6spd and the synchronizers are bad... any one have a used 6spd tranny?

I have one, It works good.
Steve@RSD
Steve@racespecialtydesigns.com
(707) 365-0117