CM trend / CM low come from Cardmarket's official daily price guide. They mix all languages and all sellers, so they are a reference, not an English offer from a trusted seller. Click to check the real English listings on Cardmarket.
Margin = sell price × (1 − 5% fee) − €0.50 − landed cost. "shops median" = median price across at least 3 shops that have it in stock; "verify listing" = less than half the market price, check before buying; set your own sell prices in data/sell_prices.csv for accurate margins.