California - Seating Locations at Petco Park

I will be in SAN in a couple of weeks when the Padres are in town, and I'd like to go to my first game at Petco. A couple of questions:

1) Is there an area near the ballpark where people buy and sell tickets? (I'm aware of the season ticket holder's resale website, however, single tickets hardly ever come on sale there).

Failing that -

2) Are the upper boxes too high up? (the padres.com ticket sales site has a front-row upper box seat between home and first).


Thanks for your help - looking forward to the game!

1. People will sell tickets near the Omni hotel (it is across the street from Petco)
2. Upper boxes are pretty high but still fairly close to the field as they overhang the lower seats more than at many other stadiums.