Newegg offers the Seagate 4TB USB 3.0 Portable External Hard Drive for $104.99. Coupon code "EMCSRKRG3" cuts it to $94.99. With free shipping, that's $5 under our June mention and the best deal we've seen for this drive. (It's a low today by $13.) It features mobile backup via an app for both iOS and Android devices. Deal ends October 7.