Cheapest way to drill a hole? How cheap are we talking? Somehow I get the impression that you dont have access to a drill or dremel? At first I wasn't sure about whether or not to answer, but hey everything is possible.. I know I didn't have squat some years ago (second tip).
At the very cheapest just buy (or loan
) a drillbit (0.8mm to 1 mm diameter or so) in a hardware store and hold it between your thumb and index finger. Then move your index finger along the thumb such that the drillbit rotates, and then move the index finger back up so it rotates backwards... and so on and so on. Careful to only touch the round upper part of the drillbit. Take your time. 10 holes should be possible in a little while or so? (You did ask for cheap
Or, if you have an electric shaver, modify it to support a drillbit. This I actually did some years ago! :
I used parts from a compass (at least I think its called a compass, but I don't mean the magnetic one. It's a tool for drawing circles, like this:
and one of those plastic connection terminals
I don't remember anylonger exactly how I did it, but I think I fastened the tip of the compass with one of those terminals (took it out of the plastic like in the picture), to the electric shaver. The tip of the compass served as the drill chuck, and I (probably) taped the upper part of the drillbit to make it thicker and fit. Maybe you can do wwithout the compass too, experiment
The trouble is getting it to rotate centered and not wobble too much.
How's this for cheap holes?