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I do price every batch of soap I make, not so much to alter the price but rather to keep my profit margin intact.  I keep a soaping notebook which contains all of my pricing per ounce for each item I use.  Each recipe is printed, dated, and priced.  I write notes of what I did and what I thought of the batch and make note of things I'd do differently the next time, whether I can decrease or should increase the fragrance, etc.
With the pricing per ounce is my marker, it's easy for me to figure out whether one company or another is a better deal for my supplies.