I buy brown sugar there, frozen chicken breasts, hamburger and hot dog buns, milk, carrots, lettuce (we eat a lot of salad). And for us the discount on gas is worth it. We live in an area that had high gas prices.
As far as staying away from…..I would say canned goods in general. Most of the time I can get them cheaper with a coupon at Fred Meyer (Kroger) or at Winco. I love their fruits but most of the time they are more expensive that other stores. The exception to that is bananas and pineapples.Watermelons too when in season.