Vaseline is better than everything. Very cheap too.
I started just putting some on right before I went to sleep every night and that solved almost every chapped lip problem I ever had. Rarely need chapstick. They also make a vaseline lip balm tube that is easier (and more socially acceptable
) to carry around.
I was on Accutane a few years ago and I tried everything. Vaseline worked best.
If you want flavored or colored stuff though, try the little tubs made by Jane's - they sell it at Walmart. Also cheap!
(can anyone tell I'm broke???)