Take out a second mortgage for the 100 sections. 200 sections are decent but not cheap. 300 sections are less expensive, but it can take a while to get to/from your seats up there. Also, just so you know the top row in the 300 section is really far from the field and really high. when they do a flyover, you can see the top of the planes from those seats.
The best way is to go through Seat Geek and buy just prior to gametime.
either way, expect to pay over $100/seat. I buy whatever seats are the absolute cheapest and walk around/stand to watch. There are some great vantage points. plus people watching