First, make sure the cards you want to sell are in good condition. Baseball cards that are faded, creased, or otherwise damaged will be much harder to sell. Take the time to carefully examine each card and only select your best conditioned cards to offer for sale. The condition of the card is extremely important to collectors.

Once you’ve sorted your cards by condition, you’ll want to do some research to determine which players and years are most desirable and valuable. Look up recently sold prices on websites like eBay to get a sense for what certain star players from popular vintage years tend to fetch. Focus your sales efforts on rookie cards from the 1980s or autograph and serial numbered cards featuring star players. These unique and collectible cards will attract serious collectors and resellers.

When taking photos of your cards for listings, make sure the images are high quality and sharply focused. Bad or fuzzy photos could turn buyers away. Show both the front and back of each card clearly in the listing. Propelly formated listings with multiple photos usually sell for higher prices than those with just one stock image or a basic text description.

Pricing your cards competitively is important to attract interested buyers. Check the recently sold listings on eBay to get a sense of fair pricing for comparable or graded condition cards. Price yours slightly below average to encourage bidding wars or quick sales. You can always slightly lower prices over time if a card doesn’t sell right away. Avoid pricing things too high just because you see one outlier sale for a lot of money.

Some of the best platforms for quickly selling baseball cards at scale include eBay, Craigslist, Facebook Marketplace or card shows/shops in your local area. eBay allows you to reach buyers across the country and package multiple lower value cards together to reduce shipping costs per card. Craigslist and Facebook Marketplace are good for local sales to avoid shipping entirely. Card shops will buy collections outright but often at bulk discounted rates versus selling individually.

When listing on eBay, be sure to use optimized titles that include the player name and year to attract collectors searching. Provide thorough descriptions of any defects, autographs, or other notable details about high value cards. Clearly state any returns policy. Ship cards securely in hard plastic cases or sleeves within a tracked bubble mailer or box. Positive customer reviews will help you build a good seller reputation for future card sales.

For local sale avenues, create a well-organized display of your cards sorted by player/team. Consider grouping value cards thematically together to make them easier for buyers to find what they want. Negotiate prices in person but be willing to offer small quantity discounts for bulk purchases. Accept payments through secure methods only like PayPal, Venmo or tracked bank deposits to avoid potential scams.

Following these tips on properly evaluating your collection, listing high quality photos and descriptions, pricing competitively and platform selection should help you sell your baseball cards quickly to collectors while still maximizing your potential profits. With some diligent prep work and an online sales presence, you can move valuable vintage cardboard within a short timeframe for good returns. Let me know if any part of the process needs more clarification or expansion.