Is eBay the best (or only) option? I have 6 tickets to a Diamondbacks game in May that I need to sell. My vacation plans changed and I will be going to Phoenix in June instead of May.

The game is Tuesday 5/20 against the Giants, if anyone here is interested...

Is there a chance if you contact the D-backs they might exchange them for tickets to a game in June (if they're at home while you're there)?

I agree, Joe. The Red Sox' order confirmation says "Tickets may be exchanged for another game (subject to availability) and must be exchanged
at least two weeks prior to the original game date." Chances are the D'backs will do the same.

I think different teams have different policies. The D-Backs' ticket policy page (and the email confirmation I have) says "There are no refunds, exchanges or cancellations." Thus, my problem.

I would call them anyway. Sometimes teams will make exceptions, or they have a policy that's different from what they state for the public record (just to discourage people from constantly making exchanges).