Have you looked for a bicyle co-op near you? They usually horde bicycles and part them out, like a "pick-a-spare" would do for cars. We have a great one here,

Have you looked for a bicyle co-op near you? They usually horde bicycles and part them out, like a "pick-a-spare" would do for cars. We have a great one here, you can wander the wall of hundreds of bikes and pull off whatever you need. Great atmosphere as well, like a makerspace exclusively for bikes.