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Well, I'm sure that others can chime in with their experience. I can only tell you what my first batch cost me. Using 112 ounces of oils plus the distilled water, the lye, fragrance, and lavender buds, my first batch cost $28.77 including the cost of shipping. I cut my bars today and while they're not perfectly even in size, I got 33 bars of soap plus 9 soap balls that I created out of the trimmings. Each soap ball is about 1 ounce. Keep in mind that your bars of soap will lose some weight as they cure. Next time, I'll probably cut my bars a little bigger to account for the trimming that I had to do.
Keep in mind that your cost will depend on the price you pay for your oils and whether you use basic oils or add luxury oils as well. If you buy in bulk, you'll pay less per pound but more money up front for those supplies.
I just used an old desk drawer for my mold with a heavy cardboard box lid as a cover. I lined the drawer first with plastic wrap and then with waxed paper, taping down the sides to keep it as flush as possible. Old towels were used to insulate the mold.
As far as how long it takes, the actual working time was pretty short since I had a stick blender. 24 hours after pouring my soap, it was ready to be cut. Now I wait for several weeks for it to harden.
If you haven't done so, read through this thread. There are recommended books, websites, and videos that'll give you a good idea of what to expect.
And, let us know how it goes!