In the engine category there are many gems at the junkyard. Accessory drive brackets are valuable especially if you are starting with a crate engine or new long-block. Plus everything from starters to alternators, distributors, and power-steering pumps have a core charge if you're looking at rebuilt units, and those core units are plentiful at junkyards. Just research what the core charge is and don't pay more than half that for the junkyard version. Also find out what is needed to qualify a core, as some shops can be strict on damaged units.