Newegg offers the Western Digital 3TB Red Serial ATA 6Gb/s Internal Hard Drive 4-Pack, model no. WD30EFRX, for $359.99 with free shipping. That's $90 per unit, $4 below our mention of this quantity from last month, and tied as the best per-unit price we've seen. (It's a current low for this quantity by $80.) It features a 64MB cache and runs at 7200 rpm.