Not really "a lot" it seems. If you look at the price for "No merge by January 1st" it shows $0.03, which seems promising, but you can only buy like $3 worth of contracts at that price. If you try to buy $1000 worth, your average price shoots up to $0.52! Not sure if this is just a particularly thin market, or whether there's not actually a deep well on confidence that the merge is coming soon, or what.