The BEST so far.

[JoshR]

Yeah I love the one we got at work. I use a 200 psi/14 bar bike pump to air it up. I'm a decent shot on mid range shots by hand but, if it's tall tree I can sit there for 30 minutes trying to get the right shot. this can definitely save some time.

 

[TimBr]

They're about $18us for a box of 40 (12g) = $.45 for a full shot of 80-90'.
A hi-volume bicycle floor pump will give about the same result with 6-7 strokes.

A much belated thanks to SingleJack for this post. I don't think I ever followed up to do the research on those pumps, where and how much, etc. It seems like they could save a lot of time, short of using the compressed gas cannisters.

Thanks again.

Tim