Where would you look for used string trimmers, preferably ones that are not working? I like to work on them in my spare time and can always use a spare. I find it rewarding to fix up a trimmer or blower that someone thinks is worn out or is PO's at because it won't start, so they give it to me and I get years more use out of it (only happened once). Not looking to spend much to acquire any unit and I don't care to pour a bunch of money into it either other than a few parts here and there. Ebay isn't much help because people are willing to pay too much for whatever reason, neither are local pawn shops because all they have is homeowner junk. Any advice?