I have a bucket of 72 Tretorn Micro-X tennis balls for sale. They've only been used once in a ball machine for about 1 hour. They still look new and will keep their bounce for a very long time as designed. For those who don't know, these balls have millions of micro beads inside that keep them from going flat like regular balls, so they're ideal for ball machines or practicing. I've heard of some people using them for several years before having to replace them. My asking price is $85 including shipping. If interested, contact me at email@example.com.