Local whole-animal butchers or those specializing in "nose-to-tail" dining often have offal. Sites like Paisanos Butcher Shop sell frozen beef intestines directly.
Fresh intestines require extensive cleaning (often involving salt, flour, or vinegar) to remove grit. If you are a beginner, look for "pre-cleaned" or "scalded" versions to save hours of prep work.
Fresh intestines are highly perishable. Use them within 1–2 days of purchase or freeze them immediately.
The Spanish term most commonly used in North America. Gopchang: Korean for small intestines. Daechang: Korean for large intestines.
If you are looking for Korean-style BBQ, Wooltari offers premium marinated large intestines (Daechang) that are ready to grill.