Four Excel workbooks for vendors and collectors. Download one, type in your numbers, and the formulas do the rest.
Your whole case on one sheet. Card, set, grade, ask, market and cost per row, with total value and margin already wired. Built for the vendor desk at a show.
Log every sale and expense as it happens, then count the drawer at the end. The sheet tells you whether you are over or short before you leave the hall.
What you paid against what it is worth now. Gain or loss per card and for the whole collection, colored so the movers stand out.
List what you give and what you get, and the sheet prices the gap. Under 3 percent of the larger side reads fair, the same band the app and the calculator use.
Each workbook opens in Excel, Numbers, or Google Sheets. The formulas are plain SUM and IF, nothing to enable and nothing to sign up for.
The same math runs live at the table: the trade calculator works in a browser with no install, and the beta is free while it lasts.