It’s pretty awesome that free navigation apps are so popular on smartphones these days because it gives everyone access to a service that used to be very expensive. Of course, the popularity of free navigation solutions also drove down prices on dedicated GPS navigation systems, which are still often a better option for finding your way around. From now through Saturday, Amazon has two of TomTom’s best personal navigation devices on sale — the TomTom VIA 1535TM 5-Inch Bluetooth GPS Navigator and the TomTom VIA 1505M 5-Inch Portable GPS Navigator — and both models come with free lifetime maps.

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