The biggest issue for old rubber balls for pro shops, is that they dull the drill bits down real fast and they permeate the shop with a burnt rubber smell for most of the day.
We'll plug and drill/redrill them, but we might charge more, plus put it at the end of our daily schedule so that the shop has time to air out for the next day. Some pro shops will refuse to drill rubber balls. Rubber balls are dinosaurs. You might have problems getting it drilled locally so check that out first before you think of getting "a
deal".
But the all mighty dollar
deal might cost you, to get it drilled. Plus make sure that whatever product you are buying to get the free rubber ball is a premium ball with a good cg to pin location etc........ Of course if you have warrenty issues you will have to go back to your internet seller on both balls.
Erin