Aliexpress
Click here… to search for Geeetech I3 Pro B 3D Printer DIY Kit on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (288.99 USD): 13f142
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): Wholesale20, bGpAnDacHeCk, Email5, BG3DP09B, 7d18f7
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for Geeetech I3 Pro B 3D Printer DIY Kit is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).