For years I have been searching for something like this:
I first saw this is a gift shop on Long Island in 1992. It only had one hourglass, but was finely made with a wooden stand and went for something like $80.
A few years ago, I saw a bunch of cheaply made abominations in Wal-Mart with day-glo sand and such a poor fit, it instantly gave away the principle behind the puzzle.
I was wondering if anyone knew of a source for the Floating Hourglass puzzle made in a quality fashion or if you happen to have one of the nice ones for sale.