I happened upon a army surplus store selling the Campingaz piercable butane canisters. They also had the Coleman Powermax fuel cans. The mid-size Campingaz cans were $3.99 (all prices USD) each, and the jumbo cans were $5.99 ea. The Powermax fuel was I think $4 each. The store is located in Kansas City, KS. If you want more info, PM and I can provide the store name should you want these.
You should snap up those powerMax ctgs, they're going to be like gold soon. They stopped making them last year... Good trading material. Not to hijack the thread, but does anyone know where to get new (pliable) rubber grommets for the S-200/206 cartridges? I have a couple of stoves and some ctgs, but I don't trust those hard bits...
I'm afraid I don't know what a GT106 looks like. Searches on Google were basically circular in nature, referring back to this forum to posts of "anyone know where to find a GT106"? If you have a photo, I can keep it in mind should I come across them. I browse local flea markets from time to time and overstock / damaged goods stores. Though I have been trying to resist the temptation lately as its hard to walk though and not pick something up just because its a Really Good Price. I asked one vendor at a flea market if he had any Primus or Optimus stuff. He, and this is no joke, wanted to show me Transformers toys. ---- Edit: I did now just find a picture of a GT106. They may actually have a supply of these. Based on the photos, I think they were selling GT106 and C206. I did not closely examine the model which in retrospect would have been very helpful.