Purchasing Agent Austin, TX Salary. Purchasing Agent Austin, TX average salary is $69,614, median salary is $65,853 with a salary range from $19,240 to $1,928,889.Purchasing Agent Austin, TX salaries are collected from government agencies and companies. Each salary is associated with a real job position.Purchasing Agent Austin, TX salary statistics is not exclusive and is for reference only. They are presented as is and updated regularly.urchasing Agent Austin, TX salaries are collected from government agencies and companies. Each salary is associated with a real job position. Purchasing Agent Austin, TX salary statistics is not exclusive and is for reference only. They are presented as is and updated regularly.