http://www.canadiantire.ca/assortments/product_detail.jsp?FOLDER%3C%3Efolder_id=1408474396669458&ASSORTMENT%3C%3East_id=1408474396670271&bmUID=1145264780935&PRODUCT%3C%3Eprd_id=845524442200699&assortment=primary&fromSearch=true
I know its CANADIAN TIRE, but im sure you wouldnt have any trouble finding the same or better where you live, its just the first place i looked
$79.99 CAD so about $50 USD, rated for 750lbsx2=1500lbs I dont think the shell alone would weigh that much, but if your next project does, you could easily reinforce it (practice your welding). all you'd have to do is cut it and extend it (practice your welding)
I wouldnt say its ghetto either, got perfectly placed swivel wheels and perfectly strait. good luck trying to make a better one