I loved the post below below where Carl expressed his delight upon receiving his first bi-metal chip
I love them too - so for the newer people out there... here's another (and usually cheaper) set to watch for

Top of the Vines - California
.50c - $1.00 (eagle and casino variety), $1.50, $2.50, $3.50, $5, $25 and red (this is a cool chip!) $4 1st anniversary chip.

Also the orange Lucky Chances GO chip - all obsolete