DIY Dishwasher Detergent

I have been playing with the idea of making my own dishwashing detergent.  As prices get higher and money getting tighter I decided to do my research and figure out how to make my own using ingredients that are easy to find in my local supermarket.
Recently, I have become a huge fan of the Live Well Network but more specifically the show Deals.  The host just happened to be discussing with the Coupon Contessa how to make your own cleaners using 5 ingredients.
ONLY 5?!?!?!
Everything from laundry detergent to cleaning your counters.
This week I was specifically looking for DIY dishwasher detergent.  I was down to my last four tablets and decided to hit Smart and Final.  I found everything I needed except the washing soda.  Washing soda is apparently the most sought after product that is difficult to find.  I called Ralphs Supermarket and hoped I can just pick up a box on the way home from the gym.  The "manager" didn't know what I was talking about and after giving him the UPC number from the Arm and Hammer website, he said it was invalid and was a bit rude when he hung up.  I decided to go myself because how can they not have it, right?  After calling Arm and Hammer, turns out they did indeed have it.
Being a little pissed off for being treated with rudeness, I went to the store and found it as soon as I walked into the laundry aisle I found it right away next to the borax.  I did bring it to the attention of another manager and let her know the situation.
Last night I did stop in to Costco and although they had a larger container of baking soda but they did not have Borax, washing soda or bar a of laundry soap.
Last night I used the last tab of dishwasher detergent.  I am reusing the plastic container it came in and mixed 3 cups each of borax and baking soda.  Since I run the dishwasher about twice a day, it should last me a month.
YAY ME!