If I were to use Tide, I would spend $13.99 for 52 loads. I'm spending $3.79 for 128 loads of laundry (4 batches of the recipe - 1/4 of the supplies). I bought Mule Team Borax ($2.79), Arm & Hammer Washing Soda ($2.07) and 8 bars Fels Naptha soap ($1.29/ea) for a total of $15.18. For the same number of loads, I can spend $137.75 for Tide or $15.18 and make it myself. I think I'll make my own.
1/2C Washing Soda
1C Fels Naptha, grated
I use a box grater for the Fels Naptha, but you can use your food processor or other grater. Mix it all together and store in a plastic container. Use 1T (yes, that is 1 tablespoon) of soap in your laundry. I use 1/4C white vinegar for softener and I still use a dryer sheet for static cling in the dryer.
Don't expect bubbles like you get with detergents.