One does need to be careful however as many supermarket brands of yogurt are little better than ice cream sundaes with respect to sugar content. Look for the "all natural" brands and shun like the plague any yogurts with high fructose corn syrup and other junk like that. Also ensure that the yogurt has a "live cultures" seal on it. Without the live cultures, you might as well just eat plain ice cream. The live cultures is what makes yogurt so beneficial to you.
I brand that I like is Stonyfield Farms. Even though the owners have "Ben and Jerry" disease, it's a fine product that uses live cultures and real fruit. It does have 23g of carbs because they use real sugar. I justify that based on my 7-10 miles of walking I do each day. If I didn't exercise, I'd probably want to stay away from that much sugar and would eat plain yogurt instead. Another alternative would be to eat plain yogurt and sprinkle in a few blueberries or strawberries yourself.
Blue Bunny makes yogurt and according to the article I linked above, it has about 4 carbs per serving. Super WalMart sells Blue Bunny, but I don't live near a Super Walmart. (Can you believe there are no super Wal-marts in LA?) Blue Bunny has a website and you can look up where they sell the yogurt in your area.