Consignment means the shop sells the card for you and takes a fee or percentage after the sale. It can be better for higher-value cards where waiting may produce a stronger net result than an immediate buy offer. Selling directly to the shop is faster and cleaner because the shop pays now and assumes the resale risk. Use graded-card and sports-card local hubs to identify shops that regularly handle the kind of card you want to place.
Before consigning, get the agreement in writing. It should cover asking price, minimum acceptable price, fee, payment timing, insurance, custody, withdrawal rules, discounts, show travel, and what happens if the card is damaged or does not sell. The consignment at a local card shop guide and consignment versus outright guide explain the tradeoffs. Consignment is not automatically better; it is better only when the card, shop audience, fee, and timeline make the extra complexity worthwhile.