They might only sell by channels (partners, like normally enterprise stuff does) - contacting them directly might let you know a possible partner with would re-sell through. I haven't looked hard enough yet because I want to ask a colleague that is from china once I get back to work. If he does not find me something quick, then I will try to contact them directly to check.
But you might find some 5/6 series like these around, just to have an idea of prices... but I think this is without warranty and/or support. And the risk is quite high... at least from my view.
LMK if you get any useful info from either your coworker or from the company!