Online Marketplaces – eBay, COMC, and Sportlots are popular online marketplaces where you can sell baseball cards individually or in bulk lots. With eBay, you can list cards as individual auctions or bulk lots in a fixed price format. Completing 50+ transactions will get you a Power Seller status which increases your visibility. COMC (Cardboard Connection) allows you to send in your cards to have them graded, photographed, and listed for sale on their site where they handle shipping. They take a cut of 15-20% per transaction. Sportlots is also a peer-to-peer marketplace focused more on active traders and higher-end cards.

Local Card Shops – Calling around to shops in your area is a good way to gauge local demand and potentially get a bulk buy offer. Shops need to make a profit so their buy prices will be lower than online comps, often 50-70% of market value depending on the shop and what they need. Selling to a local shop offers an easy transaction with instant cash but likely a lower total return versus selling individually online.

Consignment with Card Shops – As an alternative to an outright bulk sale, some shops will take your cards on consignment where they display and market the cards with an agreed upon split of profits once the cards sell, often 50-50. This requires patience as cards can take time to sell but potentially results in a higher total return.

Card Shows – Weekend card shows are events where vendors come together to buy, sell, and trade cards. Some will be interested in higher-end vintage cards but many will look at modern common cards in bulk quantities to build their inventory. Competition can be stiff for bulk lots at shows and prices paid may only be 50% or less of market value.

Peer-to-Peer Sale – Reaching out to other active collectors or dealers through online communities like Facebook trading groups or forums to see if anyone wants to make an offer on your entire collection at once. This removes the work of individually listing but also means not getting full market value card-by-card. Getting a quick cash deal may result in 60-80% of estimated market values.

Consignment or Outright Sale to an Established Dealer – A small number of high-volume card dealers may be open to taking large collections on consignment or purchases outright in bulk transactions. Well-known dealers could potentially sell the cards for you at shows, through their online stores, or wholesale to other buyers. Their cuts and offered buy prices would be substantial – often a flat rate of 30-50% of estimated value for an outright bulk purchase.

So in summary – for getting the most total money with patience consider online marketplaces, consignment shops; for convenience consider local shops, shows, peer2peer sale; to get cash fast consider a shop bulk buy or established dealer but at significant discounts to estimated market values. Selling individually is most work but potentially highest long-term returns with online tools.