L.R.
I just booked a party for my 5 year old at Eola Community Center. It is a gymnastics party...they do 1 hour of gymnastics, and then you get a room for an hour for cake, craft, etc. $12 per kid, which seems steep, but a lot of parties start at $20 or more per kid. I think Build-a-Bear might be $10 per kid? Also, Enchanted Castle does a good job. They let you do your own "extras" like cake, etc. that helps with the final cost. Good luck!