Why pm? I'm sure other people would like to see if there are any deals.
I bought this one a few months ago and have been very satisfied, considering I usually stay away from third-party controllers. It doesn't have SixAxis but at $15 it is well worth it.
not sure if you have GS credit or PUR credit to make the $45 used drop into your price range but the 10% off already makes it $40 & I think there's a PUR coupon that would work the other $10 down as well. I think the wired afterglow ones are on sale for like $25 too not sure what place though.