I went from a Mach 3 to straight shaving with disposable straight razors. I wanted to learn how to straight shave without the big investment. My cash outlay for the razor blade(s), shaving soap, and badger brush was roughly $80.

If you go with just the disposable blades and use other shaving soaps, then the cost goes down to less than $40. I would encourage a shaving soap for straight shaving and a decent badger brush.

This is another option to consider.

Pabster