Baseball cards have been a beloved hobby for generations, allowing fans to collect pieces of their favorite players and relive memorable moments from America’s pastime. With thousands of cards in circulation dating back over a century, building a complete collection can be a challenging yet rewarding endeavor. Fortunately, numerous online marketplaces have emerged to facilitate buying, selling, and trading cards among collectors worldwide. Here are some of the most popular and trusted sites for selling baseball cards online.
eBay – Without question, eBay is the largest and most active online marketplace for baseball cards. With millions of listings and daily auctions, it’s easy to find cards both common and rare on eBay. Sellers range from individual collectors to large full-time dealers. Buyers benefit from eBay’s buyer protection policies and ability to leave feedback on transactions. The site takes a final value fee from successful sales. Listing is free, with an optional monthly fee for additional features. eBay’s immense scale and high traffic make it a go-to for finding hard-to-locate cards.
COMC (Cardboard Connection) – Founded in 2000, COMC (formerly known as Sports Card Direct) has grown into one of the most reputable third-party grading and consignment services. Sellers can send in their entire collection to be professionally photographed, cataloged, and listed for sale. COMC handles all transactions and ships items after payment. They take a commission on successful sales but don’t charge any upfront listing or monthly fees. This “set it and forget it” model is ideal for collectors wanting to liquidate large inventories without the hassle of individual listings. COMC maintains a pristine online storefront with easy search and filtering options.
Sportlots – In business since 1999, Sportlots is another major online marketplace specializing in sports cards, memorabilia, and collectibles. Like eBay, it offers a traditional auction and “Buy It Now” format. Sellers set their own minimum bids and reserve prices. The site takes a final value fee on closed auctions. Sportlots has a strong seller rating system to evaluate reputations. Their knowledgeable staff also provides authentication and grading services. The site is best suited for individual auctions of high-end rare cards rather than bulk listings.
Collector’s Universe PSA/DNA – As the leading third-party grading service, PSA/DNA (through parent company Collector’s Universe) naturally hosts a marketplace for slabbing enthusiasts. Consignors can choose to list their certified cards for auction or fixed price after drop-off and grading. Buyers gain confidence knowing each item’s authenticity and condition have been professionally verified. Listing and sales commissions apply. The site caters more toward serious investors than casual collectors. PSA/DNA auctions often see six-figure sales of iconic vintage rookies and rare error cards.
Cardboard Connection – While also owning COMC, Cardboard Connection runs a separate marketplace focused on vintage cards from the 1950s-1980s. Individual collectors and smaller dealers use the site to buy and sell. Listings include everything from common playables to high-grade gems. Bid-style auctions and “Buy It Now” options are available. Cardboard Connection takes a smaller final value fee than eBay. The curated vintage focus appeals to nostalgia collectors seeking affordable classic cardboard from their childhood.
Reddit – The baseball card trading subreddit r/baseballcards has grown into a vibrant online community with over 150,000 members. Users regularly post individual cards, complete sets or team lots for sale via PayPal. Feedback is left after transactions to build reputations. While not a dedicated marketplace, the subreddit allows for convenient peer-to-peer sales among a large pool of collectors. It’s ideal for moving singles, sets or entire collections in one post without commission fees. Scammers are rare due to community self-policing.
Twitter – Similar to Reddit, Twitter has emerged as an informal marketplace where collectors advertise cards for sale through their profiles, usually with photos and price included in the tweet. Interested buyers then direct message to complete the transaction. While riskier than dedicated sites, Twitter sales provide another outlet, especially for time-sensitive “FS” (for sale) tweets during live sporting events when hobby interest peaks. Larger influencer accounts also run periodic group breaks with randomized team/player assignments.
Facebook Groups – Dozens of private Facebook groups exist solely for members to buy and sell sports cards. Most require administrator approval to join and have thousands of collectors. Photos are posted right in the comments with details like price and shipping costs. Funds are sent via PayPal G&S payments. Reputable long-standing groups tend to self-police for scammers. Facebook offers a free peer-to-peer sales platform outside the commission fees of traditional marketplaces.
While individual collectors will always trade face-to-face or through the mail, online marketplaces have significantly expanded the potential buyer/seller pool for baseball cards. Sites like eBay, COMC, Sportlots and PSA/DNA cater more toward established sellers moving high volumes. Meanwhile, communities on Reddit, Twitter and Facebook foster convenient peer-to-peer sales among everyday hobbyists. With so many trusted options available, today’s collectors have never had better access to track down even the most elusive cards to complete their collections.
