I have a Cobra 19DXIV. Fits in the center console of my JK, so its discreet. There are refurbished ones on ebay for $30 https://www.ebay.com/itm/Cobra-19-DX...0AAOSwA~VaOXFF
I wired an external speaker to mine - cut out the foam around the roll cage above the driver's seat - so you can hear just fine at any speed and with the windows rolled down: https://www.amazon.com/gp/product/B01K7O0EM2/