I see where Todd and warmonger are coming from, but you guys are all forgetting something very important you can do that cost nothing, if you are driving on a damaged syncro:
Learn to double clutch when your shifting!
I drove on my bad 3rd gear for 7 months while waiting for an opening to fix and gettting funds together. Was able to shift into 3rd w/o any grind most times by double clutching and taking it easy. Sure it sucks to shift slow, but like Todd said, you make it worse every time you grind - may as well start wrapping $20 bills around the shifter if you want to speed-shift and grind every day.
BTW - Todd what's $21 compared to $2000 for an HMS tranny? Drop in the bucket. Some ppl don't have $2000 lying around when their syncro starts to go. In the meantime why not spend $21 to make the problem easier to live with whlie getting some real money together for the trans?