Downloading Maps for a GPS?

I am going to Sicily in September. I would like to download the maps for my Garmin. I can purchase them directly from Garmin for $70.00 that come on a micro SD card. I also have seen them used on eBay. Has anyone had any experience purchasing these maps used? According to the Garmin website, my model is compatible. I want to make sure if I purchase them used that I will be able to load them on my GPS.

By Rose Smith from Malvern, PA