I really like these, I gambled since they were cheap and man they rock especially on gmaes where your fingers tend to have slippage on the L2 and R2 ... they just snap right on
http://www.amazon.com/dp/B001IAOEXU/?tag=hidefnin-20
http://www.amazon.com/dp/B001IAOEXU/?tag=hidefnin-20