If anyone here is interested in glass cullet, I have purchased several times from this seller, and have been beyond satisfied! Be warned that everything will arrive smelling unbelievably strongly of cigarette smoke (a real accomplishment, for chunks of glass) but he's a super-nice guy and he seems to live near an old glass manufacturer, because he dredges up chunks of uranium and oxblood glass, among other colors, and sells them *cheap*.
Be aware that shipping will be as much, or more than, the glass itself, simply because it's so heavy. He charges actual shipping, which is nice, and usually throws in a few little chunks for free.