Online Marketplaces:

eBay – eBay is one of the largest and most well known online marketplaces for collecting selling cards of all sports and types. With millions of active buyers, eBay gives you access to a huge potential customer base. You’ll want to take good photos of your cards, write detailed descriptions mentioning any notable features or grading of rare cards, and do some research to price your cards competitively. eBay takes a small selling fee from each transaction in addition to any payment processing fees.

Collectors Universe Marketplace – Collectors Universe is the parent company of PSA and other card grading companies. Their marketplace focuses specifically on graded and high-end cards. Selling here can attract serious collectors and investors. Listings require digital photos and descriptions. Fees are slightly higher than eBay but the customer base is very knowledgeable.

COMC (Cardboard Connection) – COMC is another large online marketplace that specializes in sportscards, comics, and other collectibles. They do most of the photographing, cataloging, and logistics work for you. They take a larger cut of the sale price compared to eBay or Collectors Universe. COMC is best for those wanting to liquidate large collections without much effort.

Facebook Groups and Forums:

Sports Card Collector Groups on Facebook – Do a search for groups related to your specific sport or team and you’ll find many large and active communities for buying and selling. Make a listing with photos and details. Payment is handled direct through Paypal or similar. No fees but your audience will be smaller than the major marketplaces.

BlowoutCards Forums – BlowoutCards.com is a leading industry site and their forums have busy baseball card marketplace sections. Again, list with photos and work payment details directly with buyers. Reaches a very engaged collecting audience.

Local Card Shops:

Visit card shops in your area. Many will buy entire collections or individual high-value cards from you for cash, though typically at a lower price than you could get selling yourself online. Nice option if you want fast money and don’t want to deal with shipping/selling logistics.

Consignment with Local Card Shops – Some local shops will sell your cards on consignment, with you setting the price and them taking a commission (usually 30-50%) when the card sells. Cards can sit for a long time though.

In regards to actually selling cards, taking high quality photos of the front and back of each card is paramount. Clean the cards first. For online listings be very specific in written descriptions, note any flaws or condition issues, and thoroughly research appropriate values for each card through recent sold listings on platforms like eBay. Bundle common/base cards to sell as lots. Ship securely in rigid toploaders or small cardboard boxes and require a signature for delivery. Respond promptly to any questions from interested buyers. With some work, you can maximize what you get for your baseball card collection through these various selling options!