This SE Bikes Steel Replacement Sprocket Is a great to replace that ovaled, bent sprocket you have been complaining about. It fits a 24mm spindle and with an adapter (not included but readily available) it will work with 19mm spindle. New, SE Bikes original equipment, small storage nick on the inside of the ring (frame facing), see second and last photos.
SE Steel Bubble sprocket
Color: Blue
Fits: 24mm spindle. Adapter(not included) available for 19mm spindles
Use: BMX Park, Street, Flatland, Dirt Jump
Material: Steel