Use 'come by' to emphasize difficulty in obtaining something.

Scarcity Context

Describe recent changes in availability, suggesting something was once easier to find.

Recent Rarity

Best used in casual or conversational contexts, not in very formal writing.

Suggest a relaxed, informal visit, not necessarily planned long in advance.

Use when you or they are already going out, making it convenient to stop by.

Indicates a visit without a strict time, often open-ended.

Implies that something was earned through effort or skill.

Often used when referring to outcomes of processes like negotiation or research.