I used clothes hangers that come with my shirts from dry cleaning shop. I found there are two types of wires for these "free" hangers, one is like 1/16" with white coating, another one is about 1/8" with dark green coating. the dark green one is prefect for landing gear, and I would strip the coating of the white one and use it for reinforcement or even push rod for larger plane.
My local ACE hardwares carries all kind of rods, wires, threaded rods, aluminum strips, etc. Hardwares stores and dollar tree are the few stores still open in my town right now. But it has been raining for days and I just don't want to restock my foam board on raining day....