Yes they are so expensive and they don't work as well as your own home made. You can make most cleaning products with a few staple items such as borax, white vinegar, baking soda and then I usually add a few essential oils for nice smells. I have things storedin 32 oz spray bottles. If you want specifics, let me know and I'll give you the names of a couple of good books for exact recipes of if you want to try just a few things let me know and I'll write out the recipes.
It sounds so simple and it is. It is very effective. I have a very clean house. I do admit to the occasional use of bleach in the bathroom (like once a month or so) and sometimes use something else in the kitchen on floors. This is not because the house is dirty but because old habits die hard
I use microfiber towels on everything.
Here are a few quick tips -
Stainless Steel - Cream of Tartar, use with microfiber and buff
Windows/Glass - club soda with a few drops of essential oil of your choice in a spray bottle.
Toilet - white vinegar, baking soda, castille soap, few drops of peppermint oil
Bathroom Sinks/Counters - vingegar/water/castile soap/lime oil
Showers /tub and tile - vinegar/water/castille soap/tea tree oil
Kitchen counters - vinegar/water/lemon oil (i also add lavender)
Tile Floors - vinegar/water/castille soap/lemon
Wood and wood floors - water/castille soap/olive oil/lemon/vinegar
There are so many more options, and you can make up your own too once you know the ingredients.