The guy said he thought it was a realistic price for those bars - £50, a quick look on CRC has them for £125, if you ask me a drop of that price means they're most likely 'a bit dodgy' to say the least. But then I guess there are alot of people who 'know' that genuine expensive branded gear is the same as cheap Taiwan/Chinese knockoffs and there's no real difference.
Personally I'll stick with buying kit from proper shops (local and online) as there's someone I can sue if it turns out to be a wonky copy that's being sold as genuine parts.