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2x WD Red 4TB NAS Hard Drive 3.5 Inch 5400RPM 64MB - WD40EFRX
$25 off $200 with PayPal coupon code PP2016BTS
$279.98 - $25.00 = 254.98
These are newer 4TB Red drives that feature Nasware 3.0
The following excerpt was taken from anandtech.com
"The updated firmware (NASware 3.0) puts in some features related to vibration compensation, which allows the Red drives to now be used in 1 - 8 bay desktop NAS systems (earlier versions were officially sanctioned only for 1 - 5 bay units). NASware 3.0 also has some new features to help with data integrity protection in case of power loss. The units with NASware 2.0 can't be upgraded to NASware 3.0 (since NASware 3.0 requires some recalibration of internal components that can only be done in the factory)."