Trying to convert new fan, need 7/3 ticket

Anyone have any leads as to where I could get a bleacher ticket for the 7/3 game?  

I've convinced a friend from work he needs to experience baseball, and in particular, A's baseball.  (He's from Argentina and has never been to a baseball game!)  I thought especially a Fireworks Night would seal the deal on his A's fandom (my first game at the Coliseum was a Fireworks Night and it convinced me to move halfway across the country).

So, anyway, I have a ticket for myself but need to get him one, now.  So I'm looking for one bleacher or two Plaza Reserved (in which case I'd give up my bleacher ticket).

Thanks in advance for any advice!