I need a Hub motor for my Sunbird can anyone help!!!!!!!!!

i recently bought a very nice looking sunbird electric scooter at a yard sale the back hub motor was full of water i am good with tools but never have worked on anything electric only gas powered i need a motor and a ball park about what they cost i only paid $50 for the scooter and everything works except the motor which i know is major but the scooter itself looks new figured it was worth what i paid the way it is, can anyone help where to get parts thanks for all your help!!!!!!