Spalding NBA Zi/O Indoor/Outdoor Basketball – Link 
This is currently at just $18.99 on Amazon!
Generally this sells for about $35.
- Official-size basketball designed for indoor and outdoor use
- Zi/O composite leather cover looks and feels genuine
- Full ball pebbling provides soft, tacky feel
- Meets the NBA’s stringent ball specifications
- Measures 29.5 inches; official NBA ball weight