Who's a reputable dealer to buy a signed Mantle ball?

That's one item I want for my collection. Who has the best rep in the autograph business these days? I prefer one that's been PSA/DNA certified. Buying sigs is a risky deal regardless. I approach all deals with a bit of skepticism. I think that's a healthy attitude to take.
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Comments
<< <i>I prefer one that's been PSA/DNA certified >>
1. You just answered your own question--you want a PSA/DNA certified. If that's the criteria, who cares who the dealer is?
2. Remember PSA is a third-party authenticator. That's quite different from the question of who is a reputable seller of signed sports memorabilia.