Most times those games in the bundle will be included in a packaging that is not for retail sale.
You could, however, sell it on eBay, Amazon, or any other 3rd party service provided that you specifically mention that it came from the bundle.
You can sell it at a Gamestop.
Can you sell game keys?
Anyone can sell on Kinguin
Whether you have a spare key in your digital library or gift from a friend, you can sell it on Kinguin and exchange the collected funds for other games.
Is it illegal to sell Humble Bundle keys?
Can I sell or give away my keys? Humble Bundle products are for personal use only. We do not allow selling or redistributing keys from your purchases. For additional information into selling or trading keys please review the Humble Bundle Terms of Service.
Can you sell games that say not for resale?
Once you buy it, First Sale takes affect, and you can do what you want with it within legal reasons (you can’t make copies). You can sell it, or give it to someone else to resell as used product. If you’re giving a game from any stores brand new by itself and it has “not for resale” on it, then they’re in the wrong.
Can I return a game that came in a bundle?
You can return individual items from a bundle. There is no way they you can force you to keep something you don’t want. If a store really wanted to give you hassle simply return the entire bundle and then repurchase the item (s) you wanted. They can absolutely make you keep something you don’t want.