If its just bag seed, I would just give them away. I have a container that I keep my beaners in for a rainy day (or day when I own my own home). I've given them to a few people that said they were going to grow. You really don't have anything to lose, and I doubt you could sell them anyways unless they were all the same strain. If you must sell them, I'd say maybe $1 for 10 or something.