Yeah searching on eBay is a good idea. You could also sell them on 68kmla.org IF you wanted to become a member and be there for a while since they have a minimum post requirement for Sales and Trades most likely. It might be a good place to sell because the forum's been there for ten years or so and is entirely dedicated to old macs and collecting them, so you could have a buyer there. Otherwise go to eBay, Amazon, or craigslist (if you want shadier encounters).
P.S. The 68KMLA is super strict with moderation of their rules, so make sure to read their rules twice and follow them carefully.