Suggestion. If you're looking for old balls, go to a bowling center and look at the house ball section. I once found an old house ball that I was really comfortable using for spares one day and just asked if I could take it. The guy at the counter laughed and said, "Be my guest." If that doesn't work, hit the guy in the pro shop up. Sometimes they take balls in on trade even though they know they'll never be able to resell them. You may be able to get a ball for $5 or $10. You never know!
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You wanna bet me how much? Let's play!