this is the one i was considering:
http://www.jegs.com/i/JEGS-Performan...rentProductId=
It is $25 compared to DiMisa for $100; however Jegs doesn't clarify if that is for one tip or a pair of tips and DiMisa states their price is for a pair so Jegs might be $50 and in that case I might go for the DiMisas