Milwaukee 2880-20 M18 Fuel Brushless Lithium-Ion 4-1/2 in. / 5 in. Cordless Small Angle Grinder with No-Lock Paddle Switch (Tool Only)

$150 and higher RPM than most ebikes but you need to buy the battery separately (usually $100 for OEM): https://www.amazon.com/Electric-Lockable-Suspension-Off-Road-Commuter/dp/B09RX4R3TR

For your price range, this might be common in STL and is just under $200 but you need to supply your own M18 battery (usually $100): https://www.amazon.com/Electric-Lockable-Suspension-Off-Road-Commuter/dp/B09RX4R3TR