Cordless Rechargeable Air Duster $49.99 $33.49 at Amazon Enough of those cans of compressed air that get painfully cold after 30 seconds of use.
Keep this baby charged and use it to blast dust and hair out of your PC and keyboard. I use this model myself and it's great.
There are two machines in my house that suck up dirt and dust: my vacuum cleaner and my PC. Unfortunately, my PC is much better at it, so about once a month I have to drag it outside, open it up, and blast all that collected dust, dirt, hair, and fluff out if it.
Not with a can of compressed air, but with something better: a cordless rechargeable electric air duster, which has a nifty Black Friday discount that makes it cheaper than its ever been.
This is the exact electric air duster I use, not just on my PC but on my keyboard and laptop, so I can give it my personal stamp of approval.