You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
JPG, Working Power: Input: AC 110-240V, Platform board: Aluminum Alloy, Nozzle diameter: 0.4mm, File format: G-code, Voltage: 110V/220V, Layer thickness: 0.1-0.4mm, XY-axis positioning accuracy: 0.011mm, Nozzle temperature: Room temperature to 250 degree, Repetier-Host, Material diameter: 1.75mm, Supporting material: PLA, Z-axis positioning accuracy: 0.0025mm, Packing Type: Assembled packing, output: 12V, STL, English, Memory card offline print: TF card, Model supporting function: Yes, Product forming size: 100x 100x 80MM, Language: Chinese, Simplify3D, Current (mA): 12V, Frame material: ABS, Engraving Accuracy: 0.1MM, Host computer software: Cura, LCD Screen: No, Print speed: 180mm/s (max), Voltage Range: AC110V/220V
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. Only one coupon available!
Link: Banggood product page
1. ($158.99): 13f142
apply code in your basket (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): 7bcdf9, 7d18f7, bGpAnDacHeCk, Email5, BG3DP09B, BGCR3D10, BGCREA08
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Creality3D CR-100 3D Printer.
Price records source(s): Gearbest, 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)).