Some of the prices are Deal of the Day, which ends in 22 hours.

Ultra (speed classes: U1 A1 C10)
256GB $ 35
400GB $ 40
512GB $ 64
https://smile.amazon.com/dp/B08GYG5SVQ

Also on sale, the faster Extreme variant (U3 A2 V30):
400GB $ 60
512GB $ 80
1TB $ 183
https://smile.amazon.com/dp/B07FCQRN9K/