Honestly, I’ve got no idea what price range is plausible these days. What I do know is, that I would only buy from someone who knows what they’re doing, and who can provide a proper datasheet. But then again I come at this from an electronics angle, so I’d want a datasheet with stats on the beam, like wavelength composition, and heat dissipation etc, and not just forward voltage and current.

If you’re looking to buy a finished product, then figure out what regulatory markings it should have, like UL, CSA, CE, and TÜV. Personally I may be European, but I wouldn’t be satisfied with a CE marking, it must at least have TÜV before I’d mess with it, and I’d prefer it to be UL listed as well. Anybody can slap CE on a product, but UL and TÜV are actual testing institutions.