I've found deals using misspelled words and Honda 750, cb750, Honda cb, honda wrench, honda tools, 750 wrench, I've also looked up a Honda part number and googled that, it takes me to ebay motors quite often.
On the selling side, I'm not as sure but those are some tags that work.
I got a GS1100e swingarm, axle, pivot bolt, brake strut, chain guard, spacers and all for $85 because the guy advertised it as gs1100 rear. Most went for $140 and up without the spare parts. And it didn't need rebuilt.