Discount tire and Big-O tires(both local chains to me) have been able to special order them. I haven't been able to find them in stock locally for quite a while.
Call the 800 number at Premier Tire (Denver, Mountain Time)
formatting link
the website, click on Passenger Car in the left column. I think they don't show every make of tire that they sell. I bought 155-15 Vredestein tires, which are even rarer than 165-15, from this company several yearsago that were reasonably priced (about $45), and they have held up well. The charge for shipping was reasonable, too. Other people at RAMVA have spoken well of Vredestein. Even if the web site doesn't show it, there's a chance they sell other makes of 165-15.
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.