I buy a shrink pack of four cans at $5 (£3.26) or $1.25 (£0.82) per can here in the US. The cans are the 8" tall type and contain 8 oz (227 g) of fuel. I find them at Korean or Asian grocery stores, not the usual suspects. (Who would have guessed?). They are used for portable stoves, BBQ's, or woks. I have found it interesting to find the cans in the grocery store (what's the equivalent UK name?). I wander around the store and finally find a display with them. I have tried asking one of the store workers where to find them, but my Korean/their English is insufficient, so I wander. It's kind of fun and I eventually find the cans. I should just photo a can and show them. Perhaps, next time.