Wow, sounds like some crappy experiences with your LBSs. Can’t say I’ve experienced anything like that. Used bikes can be a crapshoot unless you know the seller. Maybe give one of the LBSs another chance? I suspect anywhere you go inventory is going to be limited or even nonexistent right now.
Are there any cycling groups in your area? If so, someone may be selling and upgrading or know someone who is. Worth a look. Nothing against stamps, but....