What kind of lumber? I’m from the interior, but have bought lots of non kiln dried hardwood from random small mills in the Fraser Valley. If you’re looking for good quality KD stuff, Windsor plywood has branches in gvrd or there’s Reimer hardwoods in Abbotsford.
There’s also a small business called tree2table in Chilliwack. The guy has a buttload of sweet hardwood he has milled solely from salvaged logs. Highly recommend checking out his wood supply, if you get more into wood working.