Aliexpress
Click here… to search for Creality3D CR-100 3D Printer on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
Coupon (158.99 USD): 13f142
(CouponsFromChina.com tip: just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
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
Price history (for all/most countries) for Creality3D CR-100 3D Printer is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).