iPhone Duos are already fetching $5,000 on eBay after selling out on Apple’s website. Listings on the auction website show dozens of sales of the in-demand foldable for as high as $4,999, which represents about $1,800 in profit for the seller. The iPhone Duo officially went on sale at 5 a.m. this mo…

duosalreadysellingebaybucksfetching