Walmart offers the Munchkin Miracle 360 10-oz. Sippy Cup 2-Pack in Pink/Orange for $8.99. That's the lowest price we could find by $10, outside of the deals below. Each cup is BPA-free and has a 360° drinking edge that seals after the child stops drinking.

Of note, Target offers it for the same via coupon code "BABY10", and Amazon offers it for the same price with free shipping for Prime members.