SELLER DASHBOARD
Your card business at a glance.
See cost basis, sales, net profit, ROI, and grading performance without digging through rows of data.
SPORTS CARD SELLER TOOLKIT
Smarter decisions.
Bigger profits.
Track inventory, calculate true profit, compare eBay vs. Whatnot, evaluate PSA grading, analyze collections, and measure card-show performance—all in one seller-focused Excel toolkit.
One-time purchase • No subscription • Instant download after checkout
Built for actual sellers
One toolkit for the decisions that cost you money.
SlabMargin is built around the numbers sports-card sellers actually need before buying, grading, listing, or setting up at a show.
9seller-focused tools
$35one-time purchase
0monthly subscription
Instantdownload after checkout
What's included
Know the math before you make the move.
📦 Inventory & Profit
Track cost basis, sale price, fees, shipping, net profit, ROI, and status.
💰 Sale Profit Calculator
Know profit, ROI, and your break-even sale price before negotiating.
⚖️ eBay vs. Whatnot
Compare true take-home profit on the same card across both platforms.
🏆 PSA Grading Analyzer
Model grading cost, outcomes, expected profit, and ROI before submitting.
🧮 Collection Calculator
Evaluate realistic revenue, fees, profit, and ROI across an entire lot.
🏟️ Card Show Tracker
Account for table cost, travel, inventory cost, and actual show-level profit.
Actual SlabMargin Pro workbook
See exactly what you're buying.
These previews come directly from the real Pro workbook. Click any image to enlarge it.
INVENTORY & PROFIT
Track every card from buy to sale.
Your main ledger for purchase cost, sale price, platform, selling fee, shipping, net profit, ROI, and status.
EBAY VS. WHATNOT
Stop comparing sale prices. Compare what you keep.
See fees, net proceeds, profit, ROI, and margin side-by-side on the exact same sale.
Know where the same card leaves more money in your pocket before you list it.
PSA SCENARIO ANALYZER
Grade it—or sell it raw?
Probability-weight PSA outcomes instead of assuming every card gets a 10, then compare expected graded profit against selling raw.
COLLECTION DEAL CALCULATOR
Don't get buried in a bad collection buy.
Estimate realistic revenue, allocated cost, fees, profit, and ROI across the whole deal.
Avoiding one bad collection purchase can pay for the entire toolkit.
SALE PROFIT CALCULATOR
Know your break-even before you negotiate.
Enter purchase price, sale price, fees, shipping, and other costs to see real net profit and ROI.
CARD SHOW TRACKER
Find out if the show was actually worth it.
Gross sales don't tell the whole story. Track table cost, travel, inventory cost, other expenses, net profit, and ROI.
MONTHLY PERFORMANCE
See if you're actually growing.
Track sales, cost basis, total fees, net profit, overall ROI, cards sold, and inventory health.
One-time purchase
One bad buy can cost more than SlabMargin Pro.
Use the toolkit before you buy, grade, list, or head to a show—and make the decision with the numbers in front of you.
$35 one time
- Full SlabMargin Pro Excel toolkit
- 9 seller-focused tools
- No monthly fee
- Instant download
- Secure email delivery
FAQ
Before you buy.
Is this a subscription?
No. SlabMargin Pro is a one-time $35 purchase.
What do I receive?
The SlabMargin Pro Seller Toolkit Excel workbook shown on this page.
How is it delivered?
Your download begins after checkout, and a secure download link is also sent by email.
Can I customize the fees?
Yes. The toolkit includes seller settings for your own fees, shipping, grading costs, and targets.
Know your cards. Know your profit.
Stop making expensive decisions with guesswork.
Put the math behind your next buy, grade, listing, collection, and card show.