Either way (and I said selling because of the shipping fee) I believe it's still illegal to do anything with expired or recalled baby items other than to throw them out. I could be wrong on giving it away for free but I'm pretty sure it's still illegal for safety reasons. I would check google on that if I were you just to be safe and avoid any issues you may have from a 'buyer' (auction winner).
What condition is it in? Excellent, very good, good, fair or poor. I'm not worried about the expiration because being a Grandmother, I would use it only as a seat in the home. My son and wife are getting a new one for the car :-)