This popped up on my "Recommended" list on Amazon:
The price works out to just over a dime per square, less than 1/4 what other cubes cost. They look identical to what I've been using (wouldn't be surprised if they're both made by the same company). And with a box of 144, I won't be running out at the wrong time (well, at least, not for awhile).
I've tried the oil-soaked paper towels and the alcohol, guess I still prefer the "ritual" of a starter cube; recommended if that's what you like.
Live fast, die young, and leave a well-marbled corpse.