One page on their website indicates:
"Greentech Renewables is one of the largest electrical product *wholesale distributors* in the country. We ship our own inventory every morning from 70+ locations nationally. With a fleet of trucks, we’re there when you need us, providing local support at national scale."
Basically, if they weren't always a wholesaler, they are now. About the same as HVAC, plumbing, electrician, and other outfits that want only to sell to "the trade", and you have to do some legwork to either get around that, or find a seller who will sell to individuals (not in "the trade").
I've always just wanted the product, as fast as possible, with the best warranty as possible (against a doa or warranty issue) ... usually after lots of research. If they have some online help that is readily accessible (forums, tech support emails, etc.), then that is gravy. I believe this is the way of the world these days.