Low power pedal assist or throttle only both will suit your needs.
BMS Battery has some small low power geared motors that will suit your needs.
The shipping will be another big chunk of cash also.
Bafang 48V500W CST Rear Driving Hub Motor is on sale for $199usd
Put it on 36V 8-10Ah
36V10Ah Lithium Ion Electric Bicycle... is $160usd
S-KU125 36V 48V for LED810 700W30A.. for $35usd
A couple thumb throttles for $4 under "Parts"
S-LCD3 LCD Meter for S-Series Controlers - Display if you'd like $30
Charger - $25
Torque Arms $15 - https://bmsbattery.com/parts/450-a-pair ... results=87