Final answer:
The question relates to Alexander Frear and his actions during a historical event involving a saloon, but without specific context or a source, a definitive answer cannot be provided.
Step-by-step explanation:
The question pertains to an event involving Alexander Frear, who stopped at a saloon to make a purchase when it was notably empty. To provide an accurate answer, there would need to be historical context or reference to a specific historical event or account regarding Alexander Frear's actions. The question seems to imply a specific narrative, likely related to a historic account or possibly a literary context in which this character is mentioned. Without more context or reference to such a historical or literary source, it would be difficult to provide a definitive answer to what Alexander Frear stopped at the saloon to buy.