Sports-card buying is highly category-specific. A shop strong in modern football breaks may not be the best buyer for pre-war baseball, and a vintage specialist may not want piles of recent base cards. Start with sports card shops, MLB card shops, or vintage card shops depending on what you own. Call before visiting to confirm buying hours, buyer availability, payment method, and whether the store wants your era or sport.
Sort the collection into sensible groups: stars, rookies, numbered parallels, autographs, graded cards, sealed boxes, vintage, and bulk. Condition drives value, so do not clean or alter raw cards. The how to sell baseball cards guide is useful even for mixed sports collections because it explains comps, eras, and shop economics. Bring a concise inventory for better cards and keep sentimental items separate. A fair shop offer will sit below retail because the store assumes authentication, pricing, storage, fees, and market risk.