For its newsletter subscribers, newegg offers the Sans Digital TowerRAID 4-Bay eSATA/USB 3.0 Hard Drive Enclosure, model no. TR4UTBPN, for $179.99. Coupon code " EMCNBNH42" drops it to $129.99. With free shipping, that's $50 off and tied with our mention from last summer as the lowest total price we could find. The enclosure holds up to four Serial ATA hard drives configured as RAID 0, 1, 3, 5, or 10.