This is what you're looknig for...in my opinion. Cheap and simple, and lasts for MANY uses. I always used paraffin to make these.
Although, truth be told, most every time I just grab a couple paper towels from the kitchen on the way out back to light up the grill and pour a little cooking oil on them.
However, if you want a cheaper alternative to the fire starter cubes, this is the best I can recommend.