The motherboard will come with SATA connectors, they may even be right angle ones I'm not sure what ASUS are shipping these days.
Additionally the case should come with all the screws you need for your build.
I can't figure out where you are buying these parts from - I don't recognise the basket. The best way to make your build cheaper is just by trying to do a similar, if not exact, build on another website. I use these sites in order of preference: