You can create price alert here, copy coupons and view price history. What is best price?
Battery Capacity 60V 7.8 ah Lithium Battery, Charging voltage 100V-240V 50/60hz, Wheel Size 17 INCH Vacuum Tyre, Certification CE, Max Climb Range Less 30°, Wheel Hub Alloy Hubs, Motor Brushless, Charging Time 3-6 Hours after running 30KM, Waterproof Grade IP54, Gross Weight 30KG, Brand Name MACWHEEL, Power 500W, Model Number D2, LED Indicator Lumen 500lm, Loading Capacity 120KG, Max Speed 20Km/h, Dimensions 650mm*430mm*1050mm, Color White / Red(As the picture of option shown)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($817.19): ERidingMarch
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): e1cbe5, e2bcea, BgAuMotor, TTxBG10, 502C6B, BGMOTO25, BGAutos, 7bcdf9, BGAFF7OFF, BGEBSC15
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Do you need price history chart (for all/most countries) for MACWHEEL D2 Self-Balancing Electric Unicycle? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).