Could always just ditch the pegs and upgrade to their newer slipper setup:
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXSGN1&P=7
Then again... if your looking at saving $5... a $20 option may not be in the cards.
I want to say some guys used to used loose bearings... like what's used in a 2wd ball diff.
What I hated about the pegs was that they were a PITA to put back in. I would always crush at least one... stupid 12 pack of pegs... Traxxas should have at least been courteous enough to make it a bakers dozen for peg crushers like me!