Needed: Stones 1lb - 10 lb

I'm unemployed, and, Disabled. However, I'm trying to turn my front & backyards into mini Food Forests. I need a variety of stones ranging from 1 - 10 lb to make raised beds, anchor weed collars, etc. If anyone knows where I can get some (FREE), it would be much appreciated. They don't need to be pretty, broken cinder blocks, and, cracked pavers are fine. Unless, someone knows where I can go Rockhounding close to Brooklyn, 21225. Most of the parks don't allow it. Does Patapsco Park allow it?

Thanks, everyone