Some of the more expensive GPS units available at Walmart in June of 2015 include Lowrance HDS-7, Simrad NSS12, Simrad NSS16, Garmin GPSMAP 7215 and Raymarine E165. Other more expensive units for sale at Walmart include the Simrad NSS9 and Humminbird ION12.
The most expensive GPS unit available at Walmart is the Lowrance DS-7. The product comes with a two-year warranty, offers superior time-to-location and has 3D perspective view. The Humminbird ION12 is at the lower end of the most expensive units at Walmart and costs $2,999, as of 2015. This unit includes a one-year warranty and supports ethernet networking.