GPS devices are starting to become less popular as smartphones get better at providing turn-by-turn navigation but most users will agree a dedicated GPS still does the job better than a smartphone. The trick is get one with a lifetime subscription to map updates and traffic info.
Target has the TomTom XL335T for $79 and the Garmin nuvi 1450LMT for $159.
Radio Shack has a 5” TomTom with lifetime traffic for $99 and the Garmon nuvi 1450T (T for traffic) for $149. There’s some question whether the “T” version includes map updates or you have to get the “LMT” version (above)