Check out Dolphin Fiberglass Products too. They are eminently reasonable for their prices. You can get a 1,000 gallon plus tank for about $2000. It won't have a viewing panel though. I think it'd be hard to build a 1,000+ gallon pond right for that price.
edit: http://www.aquaculturetanks.com/
Wow amazing link thank you!!!

I like their "Grotto" aquariums/ponds. Very reasonable at a price per gallon ratio.
I'd think so. Those grotto are pimp!!!!

^^^^ Finally a good picture on this thread! Look at that belly, that's one happy kitty
Ditto