I borrow this one from work.

https://www.amazon.com/Metro-Vacuum-ED500P-500-Watt-Electric/dp/B001U899HQ/ref=sr_1_4?ie=UTF8&qid=1500051105&sr=8-4

$80, doesn't freeze up like a can of compressed air can during long usage. But it's noisy as hell.  Not leaf-blower noisy but your neighbors will swear there is a pack of angry dentists roaming in your house.