I am kinda joking a bit, in that you can probably find matched mouse and cards if you hunt high and low. What typically happens though is that the card stays in a machine and the mouse gets put away separately, and they never meet up again. You see a few "useless" bus mouse cards... a year or two passes... then you see a "useless" bus mouse.... but can't see any cards for sale... & repeat...These two I think I got many years apart, and the mouse had been sitting in a box of random mice, and the card in a box of random cards, and I just happened to see each of them recently enough that I could marry them together... I guess the sad thing is, I now have several things to plug a bus mouse into, but so far as I know right now, only the one mouse. There's this logitech card, which I will test with, but I also have an AST laptop with a bus mouse port, an ATI Graphics Solution with a bus mouse port, and another one card somewhere which I think is the Microsoft version. They gave you a decent length of cord back then, darned thing must be 8ft/2.5m approx...