I swore last summer that if I dug another AMTEL 121 in blue or aqua I was going to loose it. They come in great colors, even purple is fairly common, though anything but the two colors I mention above have eluded me thus far.
Perhaps by far the most useful part of this site is very hidden. Under the "FOR SALE & WANTED" heading click "PICTUREPOSTER ITEMS". Theres the key to the online insulator city. Virtually every collector is here. Also a very useful search feature.