I just did the cost analysis for this fun Mistletoe Soap project (here, here and here). If you own the molds already (jelly roll pan and basic shape), it's only $1.46 for each 5 ounce bar *including the colors, glitter, fragrance and ribbon*!
The Soap Queen (aka Anne-Marie Faiola) blog talks about soap, toiletries and all manner of recipes and experiments around making your own goodies. I also muse about being self-employed, women in business, good design, cheese and decadent sweets. It's a bit of a potluck - enjoy!