How funny that I run across this the day after I purchase both a Genesis and a original 8-bit NES on eBay... lol!
You can try to bundle the consoles and games together and sell them each on eBay. If you have a full system and a package of games, they seem to be bought up rather quickly. I lost bids on 3 different items before I finally just went ahead and looked for one I could buy for a set price, rather than bidding. Check out what people are selling them for. I've never sold anything on eBay, but it might be worth your time to find out?