Since I'm in Chicago, I do quite a bit of craigslist. As far as my seat preferences, I like anything in the 400s or 218-224, which is behind the plate but up. I used to show up day-of and get terrace resvd for $30 up in 222. They were excellent seats. Just watch out for obstructed view. What was that site that lets you see the view from any seat in the ballpark? I lost the URL, but that was a great tool.