I guess with all brands it's a try before you buy. Go have facials from all the ones you are interested in and get as much info from the salons as possible. I would also get as much info from the brands themselves.
I am a trainer for Environ and I would want to know what else can I do with this product range eg is it just facials? Do they offer. Peels? What about advanced aesthetic procedures like micro needling! ( all of which Environ does) also what support will I get from the company eg skin analyst events, rep meetings, seminars etc?
Working topically on the skin gets some great results but can you add to these results with nutritional supplements with the company you decide to work with? In the Uk and Ireland, Environ is looked after by the iiaa which also has The Advanced Nutrition Program which can boost results from the inside.
And as for eBay, we try! Honestly! If we find accounts selling on eBay we close them down.
Good luck with your search, hope you find something that works well for you.
X Aileen