Scalping is legal in Arizona, although usually prohibited with 500' of the ballpark. The tickets are generally inexpensive enough that it's not an expensive option to pick up tickets from the scalpers who are always to be found on the main routes into the parks, and this is often the best way to get the best seats. At Peoria, if you want people from minor league camps, watch for when they walk in from the practice fields. If you don't like paying ballpark prices, you should check the ballpark rules about bringing food before heading in. I haven't had time to write much on this yet, but if you enjoy the nightlife I suggest a hotel in or within walking distance of Old Scottsdale.
All stadia are accessible and there is a wide variety of restaurants and bars in walking distance.
I've stayed at the Scottsdale Days Inn and been satisfied, but I've spent most my trips staying with relatives and have not reviewed options carefully. Here's our personal trip plan for the 2001 Cactus League. If you're going to be down there at his time and would like to say hello, drop me an e-mail. This site has swell views of the Cactus League ballparks that let you swivel the view 360 degrees.