$30-$35, deals on ebay all the time
get the ones with 3/16" axles and change the rear bearings if you have the older 1/4" version
the come in black, shinny, and aluminum
look here
http://www.miponline.com/CVDassoc.html
MIP CVDs FOR TEAM ASSOCIATED
MIP CVDs(constant velocity drives) Stock replacement universal drive axles for most RC cars, buggies, and trucks. Precision machined of alloy steel, hardened for strength, and finished with a black oxide rust preventive coating. CVDs have near zero backlash, the most positive acceleration available, and no binding. MIP CVDs are completely rebuildable with all parts sold separately, and installation requires no modifications.
Shiny CVDs: Five time world championship winning MIP CVDs (constant velocity drives) are also available with our new Shiny coating. Not just for looks, Shiny CVDs are stronger and last longer. Shiny CVD bones are available in pairs as well as in complete kits.
Aluminum CVDs: The new lightweight aluminum alCVDs drastically increase acceleration and top end speed without sacrificing durability. They are manufactured from a very high grade aluminum stock, and then bright dipped and anodized with a sexy blue gray finish.
PART# DESCRIPTION PRICE
1007 CVD Kit for RC-10 27.50
1008 CVD Kit for RC-10T/GT/ w 1/4" axle 32.50
1082 CVD Kit for RC-10T2/GT/T3 w/3/16" axle 35.50