It's been a while since I searched for a safe vacuum cleaner to use inside of a PC, but This One sells for about $60.

I haven't purchased one myself yet, but there's no time like the present, eh?

Also of note, is that I’m not 100% sure if it is safe to use INSIDE of a PC.
I'm going to do some more research.

__________________
Huh? I thought that PX was the special ingredient that went into making the Power Puff Girls and Chemical X was coming to kill us all... #-o