Newegg offers the Seagate Backup Plus 4TB USB 3.0 External Hard Drive for $99.99. Coupon code "EMCRHCR25" cuts the price to $87.99. With free shipping, that's a $2 drop from last week, a low today by $19, and the best price we've seen. (Amazon offers it for the same price.) It features mobile backup via an app for both iOS and Android devices. Deal ends July 26.