T.T.
S.,
I have a little one that will be turning 4 this year and we will be going to Pump It Up for his birthday. While we were also concerned about the cost, we did some research on how much we would spend on invitations, food, cake, decorations, not to mention the time and stress of having the house clean and ready to have the party and it actually came out to be cheaper to have the party at Pump It Up that it would to have it at our house.
We would also be able to invite 25 kids and their parents. That is way more people than we would have been able to have in our house at one time. It also makes it a lot less stressful for you and the kids will all sleep good. My suggestion is to have it either before nap time or before bed so the kids either take a really good nap or sleep hard for the night. I was surprised at how much fun the adults had in there as well.
Here is the URL for the one in Roseville. http://www.pumpitupparty.com/ca/roseville/home-p1q8.htm
Good Luck.