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You are looking specifically for HFC134A, marked as 1,1,1,2 Tetrafluoroethane. Certain brands like 'Belkin 'The Blaster' and The Source's Duster gas are prime candidates, just make sure it's tetra.
Do NOT get 1,1-Difluoroethane. It has a much lower pressure and has been reported to corrode seals inside the magazine.
And yes. Often times you may have to break the top off of the can to get to the nib, but that's all you have to do. One thing of note, make sure the can is STEADY and you gas it perfectly straight, I've broken roughly four nibs off of my cans of duster just by tilting it the wrong way, pushing and having the nib break in two. At which point you can salvage it, but there's a good chance of getting frostbite from the leaking liquid.
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