The last strategy guide I bought was for FF7 during a preorder special at Software etc. many years ago. I never seem to run into these 1 cent guides and any problem I encounter in a game is solvable through Gamefaqs. Once in a while I think about picking up a guide for a collector's item, but after a few minutes of debating wether to get it or not, I always talk myself out of it. In fact, I really wanted to get the Phantom Brave guide, but when I saw it was $20, I knew that wasn't going to happen. If it was $10, it would have broken my 7 year hiatus in game guide purchasing.
Edit: Come to think of it, the last guide I bought was for Final Fantasy Tactics. It's still wrapped and it's been sitting in the attic at my parent's house for a couple years now. I really loved the game and needed to have the guide. I think at that point in time I thought that Final Fantasy was going to be a rare game and that i'd be one of the few people able to cherish it. I'm pretty sure the guide is a little hard to come by, but I doubt it's worth it to sell it. So, I guess this means that my hiatus is more like 4 years.