Midwayusa has the Diamondback HP 4-16x42 BDC marked down from $479.99 to $199.99; that's 58% off. This was an upgraded Diamondback that has since been discontinued. It has side focus, same optical quality as the viper (same XD lenses and XR coatings), zero reset, and overall doesn't give much, if anything, up to the Viper. I think they discontinued when they started making the Diamondback Tactical FFP. This price is as much as a standard Diamondback 3-9x40 (for a much better scope) and less than I paid for a refurbished Diamondback HP two years ago. Free shipping right now too. Thought I'd share the deal.
https://www.midwayusa.com/product/2420373744?pid=373744
https://www.midwayusa.com/product/2420373744?pid=373744