Illusion of Itehari Sale

Illusion of Itehari is on sale on Amazon for $33.99, and there's a coupon making it $28.89. I'm in the US, and don't know how long the sale will last. Here's the link:

https://www.amazon.com/dp/B0F5KR65FS?psc=1&smid=ATVPDKIKX0DER&ref_=chk_typ_imgToDp