Absolutely yes, if you own them. Even if your boxes are labeled “not for resale” or “mail order only,” you may still sell them – what this means is that they can’t be sold via a retailer. Certainly, there are some things to remember. For example, not all brands will have a high demand. Medicare-provided boxes cannot be resold, and no one will probably be interested in boxes that are expired or damaged, or come with broken seals. But so long as they are a popular brand, in usable condition, and have a minimum of 6 months prior to expiration (you can get half price for particular brands that are expiring in 3 to 6 months though), then you could be holding the money in your hand in just a few days!