ATM you can buy Surpass Hobby 550 RC Brushed Motor 12T/27T/35T for $11.89 (in Banggood). Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Surpass Hobby 550 Brushed Motor 12T/27T/35T for HSP HPI Wltoys Tamiya 1/10 RC Car Vehicles – 35T
Latest coupon and price update (UTC):
Banggood ($11.89)
Banggood warehouse is located in China. What about the price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $10.76) We have found one coupon for this product!
Link: Banggood product page
Price without coupon: $16.99
1. ($11.89): BG06161e
put item in your cart and apply coupon code there 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): BG7e1f06
(these coupons are old, so probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Surpass Hobby 550 RC Brushed Motor 12T/27T/35T is here.
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)).