i found mine on craigslist as well, along with practically everything else i needed from one woman who was breaking down her tank. super super cheap. i definitely recommend looking around there and reefcentral-type "used" forums.
If there is a local marine aquarium society in your area you might be able to buy some off of a member for cheap.
For example, mine is the Dallas Fort Worth Marine Aquarium Society (DFWMAS) and there's a "for sell" forum on their website. So you might google that with the name of your nearest city and see what pops up.
Fishkid...check out craigslist.com in the "hartford" area. Search for Live rock...in South Windsor theres a 75 gallon tank getting ripped down. LR going for 5 a pound, plus its seasoned and fully cured.,,theres 70 pounds, I may buy 20 of it if I decide to turn my 29 into a cuttle tank. But let me know if this works out for you.