OOS as of 08 Dec 2017.
There's a sale on the WD40PURZ model (New model, old is WD40PURX). Use the code 1205GBTES26
for the deal. These HDDs are intended for surveillance capture integrity and lifespan.
I'm not entirely sure how much the coupon is for since I bought 2 yesterday for $230 (no tax in my state) with the code. If someone could comment on what the deal is for 1 I'll gladly update the OP if it's not $115 (it might be $10 off any amount - I'm not sure).
It's $5 off per drive with this code.
I've been watching these for a while and they seem to have hit a floor at $120. I needed 2 and any amount off from the $120 is a great deal as far as I can tell. CamelCamelCamel has them at a floor of $119.12.