Suggession for Router (with DDWRT /openfirmware support)

Kindly suggest be Cheap VFM Router which supports Open-firmware like DDWRT

while checking cheapest Dual Band router i could find is
DIR-816 Wireless AC750 Dual Band Router 1849Rs but doesn't support ddwrt

D-Link Wireless AC750 Dual Band Router

Kindly suggest me a Cheapest VFM Dual band open firmware supported Router and a Single Band router with open firmware support


Note: I am not interested in multiple USB ports or Multiple High db antennas (single USB is fine )


Budget below 2k (cheaper the best) -