The closest equivalent used much in my neighborhood is the one-pound propane cylinder that goes for nearly $4 (US).
The one-pounder is handy for short campouts, but like your CP 250 cans is not refillable. Lots of people here invest in a larger cylinder and get manifolds and hoses to run one to several heaters all from one bottle. The big cylinder might run $50, but a "20-pound"1 refill would be $18 - $20, equivalent to ~$40 worth of one-pounders. Of course one doesn't "carry" the big tank - you "transport" it, and the hoses and manifolds and reducers and such.
1 The bottle that most campers call a "20 pounder" is actually about 11 pounds of fuel.
If you can save $20 per refill, you can pay off the purchase price of the bigger tank in 3 to 5 refills (depending on how many "accessories" you need to make it work).
That's no help getting you a better price for what you want - but it suggests that if you use a dozen bottles at a shot "buying in bulk" - i.e. in fewer but larger containers - might be worth considering. That's assuming, of course, that butane accessories are as available where you are as the propane devices are here. (Everything for camping here, and I think in the US in general, is propane.)