Where can I buy robotic salvage?

Excuse me, could you please clarify where one might find robotic salvage for purchase? I'm interested in acquiring some for a personal project, but I'm unsure of the best places to look. Are there specific online marketplaces or physical stores that specialize in selling robotic salvage? Additionally, do you have any recommendations on how to identify reputable sellers and ensure the quality of the salvage I'm purchasing? I'd appreciate any guidance you can provide.