Why not SATA to IDE? That may be a bit fater, assuming you have some IDE slots left. I know you can buy external enclosures for them with converters, so I am pretty sure that you can find a standalone converter, try google.
Actually, I didn't see anything on google except external enclosures. Maybe you could use a SATA->IDE then an IDE->USB. That would be kinda expensive, though. I would just go with a cheapo exclosure myself...