I've posted about making the homemade laundry detergent before, here and here .
I've just (at the beginning of October) bought another box of Borax and Washing Soda, meaning three boxes of each for the ENTIRE year.
They're something over three dollars each, we'll say $3.50 for fun, so about $21 for laundry detergent for the year.
Our clothes are clean and smell fresh, I haven't had any more problems with stains than we had before (I'm not real big on working on getting stains out anyway.....I'm more likely just to turn it into a rag than try to re-wash), and no one has had an allergic reaction to any of it. All good things, IMO. ; )