For all you proximo fans. The site is indeed gone. However they still exist! You can find them at gulfcoastchems.com. My user name and account was carried over, but address info and other info was not. Placed an order with them and all seems AOK so far.
Gulfcoastchems looks exactly like the proximo website, I'm glad they didn't disappear. They offer an option to pay with ****, is that safe? It's easier and cheaper than BTC, but I've never seen a vendor offer that option.