I love the keto-type cereal -- look at the ingredients -- you can approximate it by mixing flaxmeal(I use 3 oz) and wheat bran(I use 1 oz). I also like to add a good sprinkle of flax seeds(I add about 1 T). Add boiling water, then sweeten to taste with Splenda and add a bit of half and half or cream. Frequently I'll stir in 3-4 ounces of strawberries/blueberries.

It's really inexpensive this way -- particularly if you buy the flaxmeal and wheat bran in bulk (I get mine from Central Market, I'm sure that Whole Foods and other similar stores would also have bins of it).

I also like steel-cut oats -- another thing that I found is a LOT cheaper if I buy it bulk. I sometimes have a bowl when I feel I can tolerate the carbs. It takes about 45 minutes to cook -- but you can make up a huge batch, then refrigerate -- simply dish up how much you want in the morning and nuke it -- I've kept it for perhaps 5 days with no goining bad.