You want something like that?: http://www.pcmicrostore.com/PartDetail.aspx?q=p:10501002 Shipping on it isn't too good, but if they can sell it for 5, you should check out a local PC shop and see if they can't get it for you for a similar price.
i got mine from microcenter for 2.50. might have been ymmv seeing all of these prices tho... btw you might want a PS2toUSB the one shown above wont work....