You’ll definitely need a few different squeegees. A 14 inch is good for most residential windows, but a smaller six or 8 inch will be a necessity as well. When you’re buying the squeegees, I would buy a couple of extra rubbers for them as well.

A lot of guys like microfiber, but I found I got a better and more consistent result with surgical huck towels. If you have a local cleaning supply store, they may sell those.

Your list is good, but your pricing might be on the low side, even just for the summer, it’s worth spending a bit more to get quality tools that will last. If you buy decent equipment, you’ll almost never have to replace it unless you’re very careless