cheapest way to clone pretty much 100% of the time that i have found is ooglebird's wick cloner, all you need is the bottoms out of a pair of two liter coke bottles, some string for the wick, perlite, rooting hormone, rockwool and clones.

bore a hole in one of the bottoms, take enough pieces of twine (about 12" long or so) to fill the hole pretty good, and tie a knot in the middle. pull the bundle of string up through the hole, fill it halfway with perlite (make sure you spread the string out into the perlite)

once you get your cuts dipped and put into rockwool, put your cubes in, loosely pack some perlite around the cubes. put some water in the bottom, and maybe go ahead and wet the perlite up top.

i only need 4 clones per run so i can fit more than enough in two cloners so that even if a couple croak i will have plenty to choose from. i find a humidity dome helps, especially to combat initial wilting. just be careful to avoid letting them go too long and getting roots tangled up into the string.