Only get stuff at Costco when it goes on sale. Laundry stuff is around 3 times a year, it just rotates on what's on sale. I'll store a new container of soap if I'm within a month of needing it and it's on sale.
The Kirkland detergent doesn't work quite as well as the Tide for the stains hubby gets at work, but it's not bad. We do use it occasionally. I get the liquid only because it works better in our washer. We do have curbside recycling, even out in our rural location, except for glass which needs brought in yourself.
I have to use clorox 2 with shirts and jeans or they all get rust stains. It doesn't take much to prevent it and doesn't have to go in with every load. I usually do every other. Plus we try to have darker clothes that don't show the rust as easily. Jeans will look dirty with the rust stains. The fun of high iron water.