Ideally, any infra-red sensor SHOULD work, but lots of people say that sensors on the USB transporters don't work, and I think I've heard people say that the ones built into computers don't work. You could try it, but I wouldn't guarantee it.
Personally, I think that the cell phones are the best bet. They work (nearly) every time, and I've heard of people getting them for only $10 on eBay.