Contact
Contact Slab Compass
We welcome corrections and new data — this directory gets better when people who know the hobby weigh in.
Reach us at [email protected].
What's most useful to send
- Price corrections — a grading company's official fee page where our figure is out of date. Include the URL so we can verify and re-date it.
- A grader we're missing — especially outside the US (Latin America, Africa, Asia, smaller European markets).
- A landed-cost component we've marked "unknown" — shipping, insurance, or tax for a market, with an official source.
We verify every submission against official sources before it changes the data — see our methodology.