Look in the Forum: Jig Tying/Lure making. Click on the Pouring and Painting forum. There is a Sticky: Suppliers Links. Some of these places have molds that Do-It doesn't make anymore. Some post on how to cast in there too.
I checked at a tire store 3 weeks ago. 5 gallon bucket of wheel weights and trash was $40. Roughly .40 per pound after the steel and zinc is removed. But a waiting list. Last years trip to the scrap dealer, I found wheel weights were $1.03 per lb. lead was $1.10 per lb. I can check next week. The lead would be a better buy.

I have cast a bunch of bullets and sinkers, I feel that the equipment has paid for it's self, all my casting now is free.
I posted all of my molds in the thread for the fall camp 2012. No problem bringing them to spring camp.