[Buying]  Buying Performance Tips?

We have some beyblades here from Christmas, and two of the tops have already broken. The plastic tip the tops spin on has broken. Two of them. We are using a stadium, on a carpeted floor. Can I buy these bottom pieces anywhere? Like a bag of them for $5 or something? I came across one website that was selling them for like $10 EACH which seemed excessive.
Which tips?
Dont buy from toywiz.com ever, overpriced. But what are the tips?
I bet one is WB and the other one is RF. Just my guess.Uncertain Also, what tips did you break exactly?