What little I've seen in helping out in the Swap Meet of late, much of this stuff is not like it use to be. One I recall was a very small part, sorta reasonably priced but almost $10 for shipping. The part would have easily fit in an envelope and mailed.
Even with personal stuff, that old "shipping and handling fee" can be a bummer.
The other big surprise in SM was one guy wanting to sell his truck but will part it out if no takers. Amazing days.
Good discussion here.
