rogueattorney
Adventurer
That's because I have the free electronic version of GAZ13 and have already decided that I'll be getting the Karameikos gazetteer. (I have the Karameikos boxed set, but I want the gazetteer too.)
I haven't checked the text of GAZ13 with the electronic version, so I don't know if there are any significant differences. However, the fantastic Fabian art (easily my favorite artist of that era of TSR products) and the gorgeous poster map of the underground kingdom would be worth the price of hunting down for me.
The maps in the GAZ series are one of the huge attractions to the series for me. I absolutely love them. And the underground maps from Shadow Elves and Thar are probably my two favorites.