Some card shops buy complete sets, but demand depends on category, era, condition, storage, and whether the key cards are present. A clean vintage baseball set, a complete modern Pokémon master set, and a low-demand bulk set are very different offers. Search the card shop directory or a specialty hub such as MLB card shops or Pokémon card shops to find a buyer that understands the set before carrying it in.
Before visiting, confirm what “complete” means for the set: base cards only, inserts, promos, variations, reverse holos, parallels, or checklist cards. Keep the set organized in a binder or box that makes verification easy, and disclose damaged or missing cards. The complete set building guide explains why set composition matters. A shop may pay less than piecing out the highlights because it assumes labor and sell-through risk, but it may also buy the whole set when individual marketplace selling would take too long.