Convenience stores: 7-Eleven, Circle K, Speedway, etc.
Grocery stores: Walmart, Target, Kroger, etc.
Drugstores: Walgreens, CVS, Rite Aid, etc.
Gas stations: Most gas stations carry lighters.
Tobacco shops: These stores specialize in smoking products, including lighters.
Online retailers: Amazon, eBay, Walmart.com, etc.
Keep in mind that the availability of BIC lighters may vary depending on your location.