Keto makes high protein cereal as does Atkins. As long as you can understand the whole "net carb" thing, I am pretty sure they are all low carb. Check it out !!
Kashi makes some great ones that are high fiber. Highest protein cereal I've seen from Kashi so far here is about 13g. Didn't taste all that great though. I go with the Kashi - Good Friends cereal. Tastes good to me and has about 5g protein 12g fiber only about 9g sugar. Kinda high on the sugar but doesn't seem to affect me. here's their
I eat the Go Lean brand and yes it is a little more expensive, probably about 1.5 dollars more. But it taste pretty good and it is better then a bowl of captain crunch health wise. I enjoy cereal in the morning so something even a little better is good for me
I don't know about anywhere else but you can buy Kashi Go Lean at Costco in Calgary and the price is pretty competitve with regular cereals. I find it pretty tasty actually especially on its own.
How unprocessed are these cereals? In case any of you have noticed in my other posts I am a big fan of pure and raw foods. In fact I am beginning to think that if you gave me a tree I would probably start to chew on the bark (just joking). Seriously though I would like to know for when I go on my carb fasting.