You must mean for a complete set of ceramic bearings? You can get a complete set of steel (or carbide?) bearings for the SC10 4x4 from Avid for $26. It's a mix of steel, rubber, and revolution (one side steel one side rubber) sides.

Avid also sells bearings individually, so you can customize your set (e.g. regular bearings for light duty steering rack and ceramic for tranny and/or drive shafts). I'm on a bit of a budget so I've only ever used the $1/piece regular bearings.

I don't have Tower Promo Codes, but if you search thread titles, I'm almost certain you can find a thread with them. I think you need to be registered or a member with Tower to take advantage (not sure, never shopped with Tower). Good Luck.