Newegg offers the Seagate 8TB Backup Plus USB 3.0 External Hard Drive, model no. STDT8000100, for $249.99. Coupon code "EMCAVAP38" cuts it to $229.99. With free shipping, that's $20 under our mention from three weeks ago and the lowest total price we've seen. (It's also the best price could find now by $20.) It features automatic and mobile backup options.
For in-store pickup only, MicroCenter offers the Seagate Barracuda 1TB Serial ATA 3Gb/s 3.5" Internal Hard Drive, model no. ST310005N1A1AS-RK, for $39.99. That's $10 under our mention from two weeks ago and the lowest price we've seen. (It's a current best for a 1TB Seagate drive by $10.) It features a 32MB cache and runs at 7200 rpm.