I just glanced at REI’s website, and they do have a section for “tall and extended sizes; I clicked on it, and they had a variety of brands of jackets on the first page. I suspect other outdoor sites (Backcountry Gear, Moosejaw, and Campmor, for example) also offer tall sizes. You might also try the website for specific brands: Outdoor Reasearch is my own favorite (I have the opposite problem: I need short inseams, which they carry on their website but not at retailers’ sites.)