Newegg has 2x 4TB Western Digital Red 3.5" SATA NAS Internal Hard Drive (WD40EFRX) on sale for $279.98 - $25 w/ promo codePP2016BTS (apply at checkout) = $254.98 valid w/ PayPal Checkout. Shipping is free.
Note, be sure to select PayPal as your method of payment during checkout.
Vikey