I'm sorry to hear about your son losing one of his buds. Unfortunately, Samsung doesn't sell replacement buds individually. You could try checking eBay, but pairing two different buds might be problematic.
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Thank you for reaching out, Sarzofam. I can certainly understand the frustration of losing a single bud for your son's Galaxy Buds 3 Pro. I would recommend sending your son's buds in for an Out of Warranty service repair to have them replace the bud itself. If you wish to have the single bud replaced, please reach out to our customer service team at 1-800-726-7864 for further assistance.
