The bi-metal issues from last couple years. I'll go on ebay looking for these and they always receive bids 2-3x it's actual currency value. I don't really get it. Sometimes an auction will receive bids that high, so it's not just the BIN's selling. I could understand if it's a set of proof coins, fine. The ones I'm talking about are raw coin listings and sometimes in lots.
Mugs that believe the printed hype. I see modern commen US Quarters selling for 4x this side. It makes you wonder. If you want £100 in £1 coins just send me £200 + shipping and I will oblige.
I've been buying other currencies like Japanese Yen, Swiss Francs and Canadian Dollar for at most maybe a few percent more than exchange. A few lots sell a little less even.