Yogurt
We switched to tubs of Stonyfield Farms low-fat, plain yogurt (and add whatever flavors I want to with real fruit or honey). It is an organic brand. Previously, I would purchase the store-brand.
I have also started eating some Greek-style yogurt. It has more protein which is great for me for breakfast or when I am working out a lot that day. It is also good for my non-protein eating son (he has stopped eating meat, eggs, cheese, and beans). I like Yoplait's a lot and it fits better into our budget (but it is still expensive about $1/cup). Stonyfield also offers varieties (called Oikos) at a slightly higher price (but you can get coupons online). I have also had a Fage and found it too heavy for me...almost like eating sour cream. Like my regular yogurt, I always buy plain and add what I want (that way I can control my sugar, etc).
Most of these brands of offered in most grocery stores including Walmart, Meijer, Schnucks, Jewel, and even small markets.
Eggs
We have decided that we will continue to purchase store-brand, regular, old eggs. We did the research on organic, cage-free, etc. eggs. Meijer does offer an organic option but it is still at least 3X the cost of regular eggs. The amount of eggs we consume (and would like to continue to since it is a good protein source for us), we cannot afford this change.
*We are now focusing on better meat choices. I'll let you know what I find out.