Decent: https://biggamebikes.com/product/eggrider-v2-bluetooth-ebike-display/
Moderate: https://biggamebikes.com/product/rad-power-bikes-35-amp-controller-upgrade-and-display/
Excessive: https://www.amazon.com/NBPower-Bluetooth-Electric-Conversion-Controller/dp/B07KNP86QB/ref=asc_df_B07KNP86QB/?tag=hyprod-20&linkCode=df0&hvadid=312131999963&hvpos=&hvnetw=g&hvrand=3487262723441116985&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9005924&hvtargid=pla-647252833866&psc=1