Walgreens is a typical place to get these. The price is good. Here is the online page for them
http://www.walgreens.com/store/c/ron...080728-product
Don't know if you could get a discount on buying a bundle of them or not. Best to ask the store manager.
If you have some time, buying from Hong Kong is cheaper, although shipping is very slow. This is a lighter that many of us here prefer. Cheap and, in my experience, can take a real beating.
http://www.dealextreme.com/p/compact...t-lighter-4179