Anyone know of a place that sells rubber bullets (real rubber, not plastic-coated metal) in 22LR?  I did a few searches, but couldn't find much.  Is there any easy way to load them myself?

I don't know where you can find some rubber bullets but there is alot of stuff you can do with .22's when you pull the bullets yourself.
Drop a wad of cotton in there and seal with wax. The wax itself can go thru a hollow core door all by itself. Don't ask me how I know [:D]. You could even load a BB or what ever when the wax is still soft. Try a pencil eraser too with out the cotton wadding.