In my experience, a quality, triple-milled soap will far outlast a cream of the same amount.

For instance, Martin De Candre is an extremely hard soap that produces an abundant amount of lather for the little that you use. My large jar should last me well beyond next year, but I also use it in a (growing) rotation of 3 or 4 different soaps.

I've heard that Mitchell's Wool Fat is another hard soap that lasts awhile, but I don't have any experience with it.