Sit-up Bench Size 90x 27x 4 cm (Lx Wx D), Product Size 94x 186x 182-235 cm (Wx Dx H), Colour Black, Brand Bominfit, Folding Size 94x 104x 182-235 cm (Wx Dx H), Material Powder-coated steel frame + Cushions, Maximum Load Capacity 150 kg.
Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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.
Link: Banggood product page
1. ($179.99): Sports23q1
2. ($187.99): BG589b2e
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGFT666, BG787e9e, BgGoodie9, BG5cd4bb, BG00c906, BG8OFFCOUPON, TTBLACK5, JanBGCoupon8
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
There is only one database record (it was for $159.99), 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)).