I just heard about two fun bouncy places that were big hits with the kids:

Bounce U - http://www.bounceu.com

(Located in So.Co)

&

Monkey Joes -  http://www.monkeyjoes.com

(located in Manchester/Ballwin)

I heard they were great and offered Birthday Parties too!

Sincerely,
Sarah

Pump it Up is another fun inflatable place for the kiddos.  Check it out at http://www.pumpitupparty.com.  There is one in St. Charles and one in Chesterfield.