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Maximizing signed Dimaggio/Mantle Balls

I have single signed balls of Mantle and DiMaggio I want to sell, so obviously to get the most $$ I need to get them authenticated.
PSA DNA confuses me. Even after looking at the website. Are there 3 options?

James Spence seems to be another option.

I would appreciate any input to the most cost effective/reliable authentication services to help me do this. I do not have a PSA membership and don't want to have to pay for that, just to turn around and pay them again to authenticate.

Thanks~ Scott
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