Staples is clearing out their Streetfinder Palm 3 GPS sleeves. They're $9.50. If you don't have a Palm 3, there's still a Rockwell Zodiac GPS board and an antenna inside.

Good luck finding them. I found 1 in the 3 Staples I visited today, still marked $60 but I asked for a price check and it was $9.50. Fair warning, none at Staples in Greensburg, New Kensington or Ross Township, PA