I believe this product, Lighter Leash, has been mentioned here before. This company also makes some other interesting products. No affiliation.

This is the case I use with my mini-bics. I find it works pretty well. It protects the lighter, it keeps the button from being accidentally pressed, it makes it a little easier to hold, and it offers some wind protection. It also adds a nice little lanyard loop. I've used one for about 6 years now and it still works great.