Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
Bearing: 2BB, Weight: 20.3 g (0.72oz), Connector Wire Length: JR 220 mm, Stall Torque (4.8V): 3.2kg.cm, Dead band: 2μs, Motor: coreless motor, Model: PDI-2004MG, Brand: JX, Potentiometer Drive: Direct Drive, Operating Voltage: DC4.8~6.0 V, Operating Temperature Range: -10 to + 60°, Operating Speed (6V): 0.08 sec/60°, Dimensions: 23X12X27.6 mm, Working frequence: 1520μs / 330hz, Operating Speed (4.8V): 0.09sec/60°, Stall Torque (6V): 4.2kg-cm
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($19.03): BGMatt2022
2. ($19.03): BGToys8
paste coupon code in your cart and click Apply 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): BG2e3f59, Cuponation9
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for JX Servo PDI-2004MG 4.2Kg Metal Gear Digital Servo.
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)).