ATM you can buy Cup for XIAOMI for 3.89 USD (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
Latest coupon and price update (UTC):
Banggood (3.89 USD)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? I think you want to know if the price is good. Cool, average is 5.59 USD, so current price is lower!
Link: Banggood product page
Price: 3.89 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BG6f2be6, BGToys8, BGMatt2022, BG74d3f7
(you can check these old coupons out, but these probably won’t work)
Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 2Pcs Upgraded Metal Steering Cup for XIAOMI Jimmy RC Car is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).