My favorite is lemon followed very closely by, I think its Honeysuckle Honeydew. The other berry/fruit flavors are hit and miss due more to personal flavors preference passion fruit for example is not as common of a taste so for some it may be an acquired taste. Mint is fairly refreshing and gives a downright chilly feeling on the lips it you like balms like that.
Lemon's the hardest to find in my experience. Walgreens has always had the best selection but even they don't all have lemon. Walmart normally has a couple in the aisles near check out with the other lip balms. Same with CVS. I don't know what kind of pharmacy's you have around you but in general those really are the best bet. Costco/Sams club and other places like that (bulk membership stores) sell a bulk pack with like 5 flavors. Also amazing Ebay. You can buy the multipacks there. Hope you find some. It's awesome stuff.