Lake balls offer a way to take a bit chunk out of the cost of playing golf. Often called recycled golf balls, lake balls are balls that have been lost by golfers on a course (often in a lake, hence the name), and then retrieved by divers and collectors for resale.
They cost a fraction of what the new balls do, and are graded by quality. We sell Grade A and Grade AAA golf balls, which are often one hit wonders, with very minor blemishes or scuffs. They might have pen markings or coroporate logos, but nothing which affects the playability of the balls.
They are also great for practicing, or even just to keep in your golf bag as a back up for one of those rounds where you can't keep the ball in play.