LM399H Precision 6.95V Voltage Reference. Used. "Buy It Now" for $6 (plus $2.50 postage).The picture shows some of the units date back to 1986!Digi-Key has them, new, for $7.94 each.
There's a 1984 date code on the far right side of that picture, fourth week -- almost 30 years old!Several years ago a friend sent me a link to an eBay auction for a 10 lb box of rocks.Rocks. Not geodes, not crystals, not mineral specimens, not polished stones, just a box of assorted river-washed rocks.And it actually sold, for something like $2. The shipping was probably 10 times more than the price of the rocks.I came to the conclusion there is always someone, somewhere, dumb enough to buy anything.