Tennibot: The World's First Robotic Tennis Ball Collector by Tennibot — Kickstarter
FXEEXD Portable Tennis Thrower/Feeder for Kids and Beginners(3lbs),Battery Powered- Supplied with Extra Ball Stack Press, Tennis - Amazon Canada
Amazon.com: Lobster Sports – Elite Grand Five LE – Battery Powered Tennis Ball Machine – Custom Drills – 12 Player Style Drills – 2-Line Narrow, Med & Wide – Fully Random Oscillation – 150 Balls – 44 lb : Everything Else
Silent Partner | Tennis Ball Machines
Pet Supplies : PetSafe Automatic Tennis Ball Launcher – Interactive Dog Thrower Adjustable Range Motion Sensor Indoor & Outdoor Toy A/C Power or Batteries Fetch Machine for Small to Large Dogs ,