How big (dims) and what material? ZooDiver works for various public aquariums, so he's dealing in levels that most private enthusiasts can only fantasize about. Cohl and I bought our tanks through Tenecor - beautiful work, but absolute crap for customer service.
If I were 15 and on a tight budget, but wanted a big tank, I'd buy a fiberglass tub from DTFiberglass, Red Ewald, or Dolphin Fiberglass (all three are good, just depends on where you are - shipping can be $$$), and install an acrylic window. Or just get a stock tub (like a horse trough).