BJ's Wholesale Club < www.bjs.com > is a big-box store, very similar to Costco, except that the stores are located only in the Northeast of the USA (and perhaps the mid-Atlantic region), while Costco stores can be found nationwide.
Last night I noticed the following interesting kosher items in the BJ's Valley Stream store (this location has the unfortunate distinction of being located directly across the street from where a poor soul was literally trampeled to death during the early-morning Black Friday Wal-mart rush of 2008).
-BJ's store brand - huge box of 50 OU glatt kosher hors d'oeuvres
-BJ's store brand - box of OU glatt kosher franks in blankets
Fresh corned beef @ $9.99 per 1 pound pack - OU glatt America kosher (?) from New City, NY
-large box of tropical sorbets in freal fruit shells - Kof-K parve
-refrigerated large spray cans of OU parve organic pancake/waffle batter (great with meat sausages and maple syrup!)
-Yerushalayim brand cholev Yisroel and parve mini danishes and pastries
-Pas Yisroel / yoshen parve Black & While cookies
-Lipton kosher soup mix (surprised to find the kosher - not the regular Lipton - variety)
-Gigantic old-school tins of retro-labled Rokeach "Old Vienna" gefilta fish, loaded with MSG (worth the price just to display them in the kitchen!)
-Gefen matzo ball soup mix
-Large 96 oz plastic bottles of Kedem grape juice