Why not buy from Misumi? I've had a few bits from them in the past no problem. Though if you want to go that route hurry up as I got an email from them t'other week promising all sorts of problems after 31st December when we're properly out of the EU, in spite of being promised a "special trade deal" with Japan. Otherwise a quick bit of googling seemed to suggest that Raptorsupplies stock the American 80/20 series profiles, huge range of vaguely Imperial sizes.