Walmart offers the Little Tikes Shopping Cart in Yellow/Red for $14.23. Opt for in-store pickup to drop it to $13.67. (Amazon charges the same with free shipping for Prime members.) That's $3 under our mention from a week ago and the lowest price we've seen. (It's a current low by $6.) It features a deep basket and fold-down seat.

Update: The in-cart price at Walmart has dropped to $13.11.