If making your own laundry detergent is not your style, don't buy the cheap brands. In the past, I thought I would save some money by buying those cheap bottles of laundry soap hoping for the same results. What I found was that these brands water down their products so that your clothes don't get as clean. What I ended up doing was using more product to get my clothes clean.
After washing my clothes with more cheap soap, I found that I could use less of a better product and get great results.