There are plenty of free fonts.
Comic Sans isn't a very good one, and is all over the place. I'll never get why people use it.
Individuality, people!
Some sprite-comic tutorials say to use Comic Sans because...
....
You know, now that you mention it, I don't understand why Comic Sans is so popular either. I suppose because of the name?
At any rate, I'll think something up. I may take to using different fonts per each character (as you can see from the last strip), but if you guys have any suggestions for a specific font, please post it.