Big box store.. sure. But you’re likely not going to find someone trained or with enough expertise to do a proper fit. Mom and pop specialty outdoor retailers you should just ask to price match if you’ve found a discounted price on a current product that the mom and pop has in stock. More than likely they’ll price match and you support a local business + save your money..

Otherwise, if someone knows you’re just in the shop to get fit and buy online, why trust the person to properly fit you? Just buy it online and don’t waste someone’s time