You can create price alert here, copy coupons and view price history. Best price?
Weight: 174 g, Support motor type: sensorless brushless motor, 3-6S Lipo, KV ≤3000;, Dimensions: 59.8 (L)x 48 (width)x 36.8 (high), When using 6S lithium or NiMH Section 18: 4274 motor, KV ≤2400;, The number of cells: 9-18 Cells NiMH, Continuous / peak current: 150A / 950A, BEC output: 6V / 7.2V adjustable, continuous current 6A (switching power mode), Applicable motor KV: When 4S lithium or NiMH Section 12: 4274 motor, Applicable models: 1/8 RC Car / truck / SUV
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 coupon right now! Check this out.
Link: Banggood product page
1. ($218.89): BGRCParts8
this code has to be applied 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): BGER18, bGhOnEy10, BGdragonBoat, BGSS10%SW, BG12457XC, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, BGDAVIS, BGHONEY2110, Parts8, BGba4995, BG80c689
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Hobbywing EzRun Max8 v3 150A RC ESC 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)).