If you're interested in making the switch to a reusable system, you can get a 5 lb. cylinder from Home Despot for about $32 and an adapter hose for about another $7 or $8. Not the cheapest alternative but good if you may be going to a more advanced stove/blaster setup one of these days and it'll keep you from the antichrist of retail and help keep little steel cylinders out of the landfills....
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse