I just purchased a Garmin Etrex Legend HCX for $182.00. There are less expensive versions of this model such as the Legend H, but this unit has internal memory only so you can't download as much as you could with a unit using micro SD cards. With Garmin a "H" means high sensitivity antenna, you would want this. A "C" means color screen, which is nice to have and the "X" indicates it uses micro SD cards. Some units have an electronic altimiter and compass, not really needed for Geocaching. So check out the Etrex line of GPS's they come in all price ranges. Once you find what you want do a Google search for that model to find the best price. Good luck and welcome to the sport.