BuyDig.com offers the Portable GPS and Battery Cradle for iPod touch, model no. XGPS251, for $29 with free shipping. That’s $51 under our mention from two years ago and the lowest total price we’ve seen. (It’s a current price low by $18.) This cradle allows the iPod touch to be used for car and boat navigation, golfing, hiking, geocaching, cycling, or a number of other uses.