They are a lot more available if you know where to look. I'm a huge fan of Adventure games.
The hey day was back in the 90's however there have been a few decent releases recently.
You can check in Just Adventure or Adventure gamers (I'm a member of both) for reviews and previews of recent games.
Adventure Gamers Just Adventure+ - Reviews PC and PS2 Walkthroughs - Previews and Adventure News!