Big tanks link >300g on Market in America...
 

Stumbled on this interesting blog/thread with what people are getting rid of in terms of large custom tanks in the order of 300 gallon and up category.... hell, even one 448 gallon cube even comes ready to go with a trailer hitch for a pittent $1500 even.

giantaquarium.wordpress.com
giantfishtanks.blogspot.ca

enjoy.