Hi Victoria and welcome to the board!
The motor Ucwepn is using here is a Tamiya Power Dash. This is one of a series of swapable electric motors Tamiya sells for their Mini 4WD collection. The Hyper Dash is another common motor from this same line. You can expect to pay from $4-10 US for these online and you may also be able to find them in a well stocked hobby shop. They are set up for various amounts of low end torque versus speed so different engines can have different running characteristics if you prefer.
The motor Ucwepn is using here is a Tamiya Power Dash. This is one of a series of swapable electric motors Tamiya sells for their Mini 4WD collection. The Hyper Dash is another common motor from this same line. You can expect to pay from $4-10 US for these online and you may also be able to find them in a well stocked hobby shop. They are set up for various amounts of low end torque versus speed so different engines can have different running characteristics if you prefer.