Today, I called Gymboree Play and Music, Shangri la branch to inquire about their birthday packages, and here's what I got:
P16,000 - for 20 kids (in excess is P500/child)
Capacity of gym is 25 kids (max)
20 lootbags w/ Gymboree toys
2hrs use, with 30mins ingress for the caterer
class for 1 hour; beyond 1 hour, the kids can stay to play
Use of Music and Art Room for the adults; Capacity is 80 adults only
No corkage for caterer/food carts
50% DP - cash, credit card
50% on the day itself - cash, credit card
They also offer Gymboree On-The-Go (services outside Shang) and it costs P9,800 for 2 teachers and a 1 hour class.
For inquiries, you may call Teacher JC at 910-7529.