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That is about 17-18 20lb bags of sand ... I'm sure if you go to an LFS in your area and tell them you want that much sand they can cut you a better price.
Not sure what price you are looking for.
You can also look in the ForSale Forum and check for people breaking down tanks and whatnot.
I got my sand from TFJ Pet Center. GREAT price, and I'm sure they'll work with you if you need that much. Oh, and they're in Toms River. http://www.tfjpetcenter.com/