I have gotten mine at my local Safeway and Fred Meyer. You can get the flaxseeds in the bulk section (much cheaper than the pre-packaged stuff and it's basically the same thing). I do that then have a grinder just for the purpose of grinding my own flaxseeds into meal (don't forget to refrigerate all flaxseeds, meal and oil or it can go rancid quickly). I have also gotten flaxseed oil at my Fred Meyer as well as Costco. Costco just started selling it up here in Anchorage.
I've seen flaxseed in my local grocery store. If you store carries Bob's Red Mill products (in with flour and grains, or maybe in a 'health food' section), they may have it.