I keep Alf's puffed wheat and puffed rice on hand. It is just that.....puffed rice or wheat. I sometimes add honey to it for little sweetness. When you put honey on the wheat it tastes like Smacks...but is healthier. You can add raisins, nuts, berries, bananas, ect and basically customize your cereal to your pallet. And best of all, it is pretty cheap. It is about a buck a bag and it is easy to find....as Walmart even sells it. I will say that I eat more of it because of it just being puffed though. But I think it is just because so much of the food is just air. So even if you eat more bowls than normal...it all evens it self out.
There are other brands that are the same but I have found that they are only available in health food stores and are more pricey. But they have more variety such as puffed millet and puffed corn. Alfs supposedly has puffed corn but I have never seen it.
p.s. It has tons of dietary fiber.....so it definitely keeps you regular!

Natures Path is good too.....
I sometimes eat the Pumpkin Raisin Crunch with Flaxseed
It is pretty healthy and not too bad of price (about 3 bucks a box..give or take a little). But I have found that it is somewhat harder to find as only one of the 3 Walmarts in my town have it....and if you buy it from a health food store it is more expensive (usually).
The ingredients are somewhat basic....but to be honest I prefer more basic. But it is nice that you can just grab, pour and eat. Instead of having to add flavor or eat bland (although to be honest I do not think Alfs is really that bland tasting).
I also eat Natures Path Granola Bars....some are good some are not as good. But they are decent priced in comparison to some of the others.
Hope that helps!