Walmart offers the Fisher-Price Imaginext Batcave Playset, model no. X7677, for $20. Choose in-store pickup via Site-to-Store to dodge the $4.97 shipping charge. That's $17 under our mention from last fall and the lowest price we've seen. (It's also a current price low by $16.) The set includes an interactive Batcave (you can download the Batcave app for Apple iPad and iPhone), Batman and Robin figures, a Batcomputer, secret walkways, a Batwing, an elevator, and jail.