My son just turned four in January. He was invited to a birthday party at Monkey Joe's (indoor play place with giant inflatables) in November. He loved it. A party there for 8 kids - no food - just juice boxes - during the week was $139. Too much for me. For his birthday I let him invite two of his friends to play at Monkey Joe's (my treat - $6 per kid) and to eat lunch at McDonald's after. He had a great time and I spent less than $35.00.