Before you begin calling around for the perfect birthday entertainers, figure out your party budget. Remember to tally up the cost of the event space, food, drinks, goodie bags and, of course, presents for the guest of honor. You'll probably notice that the cost can quickly add up.
From there, if you still want to add an entertainer to the list of expenses, you can compensate by cost-cutting in other areas. Know what kind of rates you can manage before you begin the search for your entertainer. If you're working on a shoestring budget, you may not be able to afford a Cirque du Soleil veteran clown. But if you have friends who know some neat science experiments, have a knack for face painting or break dance, you could be in business for a fraction of the cost.