Welcome to RF!!! As for a dedicated website, not sure if there is. However, there are tons of places that either make custom cube tanks or a few sponsors that sell already made ones. I'd look around in the sponsors pages and check out a few of them
No problem man... For a tank that size, I'm 99% sure that will have to be custom built. I'd check with these guys if you want an acrylic tank http://www.worldclassaquariums.com/ and http://www.innovativeaquarium.com/ (this site for some reason is down ) In any event, both are sponsors here and have many happy customers for their quality of work. I'd check them out and let them work out a price for you. If you want a glass tank, I'd talk to Ron (screen name detri here) @ http://www.aquariumobsessed.com/ as he builds custom glass tanks. HTH
welcome to the cube! I have a 36 x 36 x 24 and will never go back to a normal tank again. It takes a lot more thought to figure out flow, but it was worth it. The one thing I would do differently is go with a coast to coast overflow on the back instead of corner overflows.