rich's old gps stuff
I've been using Garmin automotive GPS devices since 2005 and have used a bunch of different models over the years, so I've gotten to know them well.
Old map data is usually the only reason anyone stops using a Garmin GPS.
If you were looking for how to update your Garmin map data for free, just use OSM...
...but you would be better off just buying a new cheap GPS. From that link, you can get one brand new for as little as $35 shipped with no coupon crap required. Screen sizes available are 5-inch, 6-inch, 7-inch, whatever. Just pick the one you want. They're all there, work just fine, come with the mount, charge cord and so on. Everything you need.