My LFS quotes $229 for one, no stands, tank only. I got lucky this weekend and snagged a 150 w/stand for 150. Ebay is good if you live near bigger cities, generally they're cheap, but people won't pay to ship, if you're willing to drive, that's a good way to go, or craiglist.
I would avoid chain supermarket stores unless they have sales, they just seem higher in price , I've done a lot of searching. Local paper is good, even post a want ad and offer a buck a gallon, somewhere someone has what you want sitting in the garage collecting dust. Hang up ads at local pet and feed dealers. There's an entire different group of people that have more or larger animals that use feed stores, but they're still animal lovers, their animals are just bigger.
Last year at this time my Aro was growing out and I got a bigger tank but had to 4x4 it to my house in the winter and the cold cracked it. So My fish jumped and killed himself ahhhhhhhhhhhhhhh, so now I'm trying again. Too bad, that last Aro rocked.