For those of you still looking for a Bumblebee Keychain there are a few on E-Bay for $4 shipped. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260219927807 I just picked one up.
For UK'ers two of these are on sale from play.com (free postage) Brawn is £1.99 and windcharger is £2.99. I got myself a brawn.