Have a look at AT90USBKEY which is available in the UK
It uses a part related to the USB chip on the Teensy, though it is much bigger. It has a few interesting extra's on which aren't on a Teensy.
[edit]LUFA, the teensy software, runs on the AT90USBKEY, and there was a recent Elektor talking about it and LUFA.[/edit]
HTH
GB