QTR I would recomend trying the small places that sell a lot of used tires if there are any around. One of the places I have found recently is a small place in a seedy part of town, they do tons of buisness cuz they sell cheap tires. I can get a bucket for about $10. One place I just take a 5 gallon bucket of iced down Bud Light and trade even for a bucket of wheel weights.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.