Walmart offers the Leap Frog Leapster2 Learning Game System in Green, model no. 21155, for $24. Opt for free site-to-store pickup to avoid the $4.97 shipping charge. That's tied with our mention from two weeks ago and the lowest price we've seen since Black Friday. (It's a current price low by $14.) This handheld game system, designed for children ages four to eight, purports to teach language arts, reading, mathematics, and science. It requires four AA batteries, not included.