There is a significant quantity of sets of the Horseshoe $2.50's in dealers' hands, Patrick. They have been valued at about $100-125 a set for several years now (about double face value). If you want to sell, you are probably better off selling a chip at a time as there's quite a bit of interest in Binion's "poker chips" from the general public lately. TCR lists the individual chips at retail of $10-15.

By the way, some of the add-on chips from later years are scarcer and sell for more than the original 20 chips.