Amazon Warehousedeals has ASUS RT-AC86U AC2900 WiFi Dual-Band Gigabit Wireless Router on sale (Used - Very Good) for $143.50 - with an Extra 20% off applied in cart. No promo code needed (price after discount in cart) = $114.80+Tax. Shipping is free
ASUS AC2900 WiFi Dual-band Gigabit Wireless Router with 1.8GHz Dual-core Processor and AiProtection Network Security Powered by Trend Micro, AiMesh Whole Home WiFi System Compatible (RT-AC86U)
Also, I am definitely no expert on routers, but from the research I have done, this is one of the few routers that feature hardware acceleration to help boost the performance of openvpn for those of us who use it.