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Magic Johnson is all about the Balls ... so much that he says he's willing to shell out nearly $1,000 for both Lonzo AND LaMelo's signature sneakers!!

The Lakers Prez was leaving Craig's in WeHo when we asked him if he was gonna cop his prized rookie's $495 ZO2s ... or his H.S. phenom baby bro's $395 Melo Ball 1s.