iPhone Pro inventory at local stores (none)

I live in the Atlanta area and am thinking about upgrading our 13 Pros to 17 Pros. Do the stores just simply not keep any stock, or do they sell out? I've tried T-life and the website and both show zero inventory for Pros within 20 miles of me. Checking zip codes further out shows the same. I guess we have to order, and then hope the trade-in goes OK at the store?

Related, how long do you have to return your trade-in? I would do it in person for fear of something going wrong shipping them. They have both had screen protectors and cases and are pristine after all these years.