Welcome to Monroeville.
There is a small arcade on the lower level (Break Away and Play?) at the Monroeville Mall that usually has one pinball. (Elvis).
The movie theater (also at the mall) has several arcade games and a Star Trek.
Kickback Cafe referenced above is awesome.
Also nearby is https://sites.google.com/site/gamesnatsite/
Depending on your time here....http://www.pinballperfection.com/
A local bowling alley New Great Valley Lanes is also nearby.
http://www.ngvlanes.com/About
They had a very nice arcade run by Pinside a member. However last time I was there, several of the games were not operational. The operator said he was in process of getting a whole new lineup, but I have not been back.
I am not at home this weekend, else I would invite you to my place right in Monroeville....maybe next time?
Enjoy your visit and good luck at your tournament!
Mike