Trader Joe's is hard to beat for all kinds of food staples - frozen, fresh, grains, beverages, etc. Each store has slightly different offerings, but I believe that the one in Bellevue (I've only been in it once, vs the one in Seattle that we visit every week) has some bulk food offerings. Give a call to them and inquire about what you're interested in. If they don't have specific or specialty things, they're likely to have enough of the basics for snacking, cooking, and baking to make the trip worthwhile. While it's not bulk foods, who can beat $4.99 delicious 6-packs of TJ's brand hefeweizen and $1.50 bags of frozen edamame?