As coincidence would have it, I just last week decided to sell one of my Saturns. It's a black US circle-button model in very good condition.
I'll have to look at recent sold listings on eBay and see what they are going for, then I'd offer it at ~15% below that average.
My next batch of items to list on ebay are a couple dozen Saturn controllers from various manufacturers, then I was going to list the console.