What are common mistakes to avoid when buying Detective Comics from a comic shop?

Avoid buying without inspecting the comic carefully. Check for signs of restoration, which can significantly reduce value. Ask about the comic's provenance and how it was acquired. Compare prices to online marketplaces to ensure a fair deal. Be wary of overly low prices, as they may indicate a problem with authenticity or condition. Don't hesitate to ask questions about the comic's history and condition. Trust your instincts – if something feels off, it probably is.