If you are looking for anything electronic, and lots of things strange, then I can reccommend these folks. They have a huge range of stock which changes by the hour and includes lots of exotic and interesting components. They price things in dollars and their delivery is free (but very slow, allow four weeks). You can pay with PayPal, which is nice too.
I had a need for a little USB hub and network thingy and these folks were able serve up just what I wanted, at a very sharp price.