Walmart offers the Munchkin Miracle 360 10-oz. Sippy Cup 2-Pack in Blue/Green for $7.10. Opt for in-store pickup to cut it to $6.55. (Amazon charges about the same with free Prime shipping.) That's a few cents below our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by $5.) Each cup is BPA-free and has a 360° drinking edge that automatically seals after the child stops drinking.