I'd recommend selling them as a lot. As for price, eh... Anywhere from 30-50/60 I'd say.
Heck, dependent on it being USD or CAD you'd be accepting, and the shipping costs, I'd be happy to pay anywhere from 40 - 50 for 'em.
Either that or them up on eBay as a bid with a base price of 10-20 or so and see how high they rise, but that also comes with the risk of them only going for the base price.
Your choice really. How much do you think they should be?