Amcrest has Blue Iris v5 on sale for 49.49, when using HOLIDAY10 coupon for 10% off.
You will be emailed the license key after checking out. Then you download the software directly from Blue Iris website http://blueirissoftware.com
and input license key
I stumbled upon this deal by looking through a deal from a year ago for v4 and an old code is still working. Not sure if this will drop again on Black Friday.
Buying v5 from Blue Iris is $69.95