If you're considering going outside the local area to hire a clown, keep in mind the fact that many clowns (like other entertainers) may charge a travel fee. This is intended to offset mileage and wear-and-tear on vehicles and equipment, and shouldn't amount to much.
Try to budget as much as you can afford for hiring your clown. Be aware that you can usually hire a clown for almost any (reasonable) budget, but you'll be hit with the truism that you get what you pay for. You won't be getting Clarabel or Bozo for $100.