I was just curious, and for once, serious.
For an example, when we lived in the Aleutians, Japanese ships with different nationalities would come in to port, and we would trade odds and ends for coins, paper money, salt and pepper shakers even!
Have you traveled anywhere and brought a "traded" something back that made a nice memory? curiously, J.

topping for fun..
Well, I must have been out on a limapparently, the right one holding my wine glass in a death grip), because I was sure there would be some "treasure tales" told.
Now my dear departed mother used to cart around English chocolate in her satchel to give away to children wherever she went. On one trip, I felt obliged to toss in a toothbrush for later.
Someone out there knows something...

I used to barter (really, equal trades)in my youth. Tee shirts, jewelry, once a baseball cap for a cool handmade reed shade hat (both of us very happy about it), and now I always bargain if I've read that it's appropriate or expected. Never if the money is nothing to me, and the seller is obviously barely making a living; that's just crass and cruel.

Bartered a jar of instant coffee for a tacky souvenier statue in Egypt.

Clever question! I love to barter.

I've bartered Marlboro cigarettes and nips of Jack Daniels for small trinkets in Nepal.

Bartered a jar of instant coffee for bread in Turkey.

Traded my pink flip flops for beaded jewelry in Tanzania.

My favorite was trading 2 beef steaks for a meal of barracuda and fish stew with a family in Belize. We ate in their kitchen and it was a great memory.

Friends once invited us to visit a popular tourist destination and we could stay free at their parents' house ... and, oh yeah, while we were there the parents needed their roof re-shingled! Turned that one down. The trouble with staying with friends is that we usually feel obligated to pitch in with some chore. Of course, my DH (Dear Handyman) is a professional who is always working so on one visit he re-wired a garage because it was, frankly, a fire hazard with several freezers running on extension cords. Another weekend we were invited to a lake house where the small dock had been shifted off its base by winter ice. It's amazing what can be done with levers and a come-along by one handman and a guy who is good at taking directions but I was sure one of them would end up swimming or that I would have to call an EMT.

Tee shirts when I sailed to obscure islands. I've got some great tee shirts from locals (used!) from Grenada, USVIs, BVIs, Jamaica, Bermuda, and the Out Islands/Abacos.

I've also traded out steaks for fresh caught lobster and fish in the islands.

I've traded small talk for free drinks many times, of course, I never have any memories from those nights