Recently I ran into an issue with my weekly D&D game. My players where trying to attack a dragon while it was flying away. It became increasingly difficult to track how high up and how far away the dragon was as it flew away. Because this was such a pain in my game I started investigating solutions.
Enter Combat Tiers by Tinkered Tactics. A set of durable acrylic platforms and stands with a one inch by one inch grid making it much easier to track your in air combat.
Paizo.com has a family pack of Combat Tiers for 40 bucks which is the set I bought.