Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Color Green / pink, Cushion width 320mm, Size 570x650x530mm, Weight 8.7kg
Aliexpress
I could not find it 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 Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB. There is one great coupon!
Link: Banggood product page
1. ($140.99): BG589b2e
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGFT666, BG787e9e, BgGoodie9, BG5cd4bb, BG00c906, BG8OFFCOUPON, TTBLACK5, JanBGCoupon8, Sports23q1, BGSaleFeb8, BGSaleAD, BGFIT022
(these coupons are old, so probably won’t work)
Price history and price alert
There is only one database record (it was for $44.99), so you can’t see price history chart.
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)).