This is what my laundry soap container used to look like...
I added a little decorative paper (left over from C's snowflake-themed 1st birthday party), some glue, a dash of ribbon and insto-presto, a lovely recycled container.
2 cups grated bar of soap (I used Dr. Bronner's Baby Mild Bar Soap)
1 cup Borax (available in the detergent aisle)
1 cup washing soda (also known as soda ash - not baking soda)
Mix well. Use 2 Tblsp. per load
It only took me 10 minutes to completely grate the soap, mix ingredients and put everything away. I'll cut my costs even further by using a less expensive bar of soap, such as Kirk's Castile. Also, we have a high-efficiency machine, and this soap works wonders.
Saving 8 cents a load may not seem like much... but, if you wash even 5 loads a week, you'll save $20 over the course of a year. $20 is a shopping extravaganza at the thrift store for me!