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Support a SMALL BUSINESS and pay no upfront taxes. (Excludes shipping within Pennsylvania)


Have a review for us?  We'll add it!  Here are a few of the recent reviews we've received back from our continuing relationships with customers.

Kurt C., IA 

Steve is a excellent person to work with in the baseball card trading market. Unlike the majority of dealers Steve is honest, trustworthy, and fair with pricing. He has incredible knowledge and will go out of his way to make the transaction easy. I would highly recommend checking out Steve if you are in the market for baseball cards. 

Arex C., NC 

I have been buying, selling, and trading with Diamond Cardboard for several years now. All of my dealings with Steve have been amazing. Whether I am selling to him or buying from him his customer service has been impeccable and top shelf.

Rick K., OH 
I've dealt with the guys at Diamond Cardboard on a few high dollar transactions. They are attentive, professional, courteous and each transaction has been flawless. I've owned 2 sports collectible stores, I'm a "Power Seller" on Ebay, I buy, sell and trade. In business, I like to form relationships, and I intend on doing business with Diamond Cardboard for many years to come! 5 stars!


Fantastic company! I have done several high end transactions with Steve for some hall of fame rookie cards. I would highly recommend his company. He was extremely fair and honest. An absolute smooth and easy transaction. A+

Brian K., KY 
I’ve purchased multiple times from this seller. Diamond Cardboard is tremendous to purchase from, provides excellent customer service, and offers top notch products. The best sport cards dealer in the business.

Bill S., NJ 

I have had many dealings over the past year with Steve of Diamond Cardboard, and in every instance he has been fair, honest and professional in every way. Whether I was buying, selling or trading, I never had any doubt that the transaction would go smoothly.