Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
Creality 3D® 310*320*4mm Heated Bed + Back Support Slide Block Plate With Pulley + Ultrabase Glass Plate Platform For CR-10S PRO/CR-X 3D Printer Part
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. I found coupon for you. Check this out.
Link: Banggood product page
1. ($169.48): BGHONEYSP
apply it 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): BG6c2dad, BGMARCHSALE, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BGBFDAY8, BGNEWYEAR8
(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 Creality 3D 310*320*4mm Heated Bed with Back Support Ultrabase Glass 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)).