Without knowing what type of cards they are, some types of cards are soaked in water regularly to remove things like excess paper glued to the back. Then they are dried by placing them between something like paper towels and and placed between large, flat, heavy items so they dry flat. Check some of the threads about soaking cards, maybe you can get them flat again, depending on type. Not advocating doing this, as a lot of people frown on the practice, but usually if you are willing to sell them as soaked, others may not care. Again, check the type for being okay to soak, and ask people on how to do it, so you get it right.
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