There used to be a place out in Bramley made it (just over the crossing, turn right) Could be worth checking out though this was a couple of years ago I saw it.
I am a fan of Heat beads and although not the cheapest I find that they give a much more predictable burn and slower as well. Generally speaking, a full basket in my 47" WSM will give me enough for an overnight cook (even in the snow) and still have anywhere from 1/4 to 1/3 of a basket left once I clean it out to start the next cook with. I order mine from Toby through SAYSAUSAGES (link above).