Look for used tennis ball machines on eBay and Amazon.com as of 2015. These sites also offer accessories for tennis ball machines, such as wireless remote controls or storage covers.
Low- to mid-priced tennis ball machine models include Lobster and Wilson, with prices ranging from a few hundred to over $1,000, as of 2015. Standard tennis ball machines can cost anywhere from $1,500 to $6,000, depending on the machine's specifications and features.
Some brands of tennis ball machines for dogs include Hyper, GoDogGo and iFetch. The Hyper dog ball launcher shoots balls up to 220 feet and comes with four tennis balls. It does not does not require assembly.
Tennis balls are made out of a hollow rubber core covered by a wool or nylon shell. In addition, the air inside the rubber core is pressurized so that the ball bounces evenly.
Find used tennis machines online at alibaba.com, ebay.com and sportstutor.com as of 2015. You can also find tennis machines in your area by checking the classified listings of your local newspaper, searching your local Craigslist site, and by checking the bulletin board...
An official tennis ball is between 2.575 inches and 2.7 inches in diameter as defined by the International Tennis Federation. Tennis balls also must conform to other criteria if they are to be used in regulation play.
Refurbished sewing machines are available from eBay, WalMart and KensSewingCenter.com, as of 2015. Some of the brands available as refurbished sewing machines include Brother, Singer, Sewcraft, Kenmore and Janome.