Sometimes, buying cheap is just a waste of money.
I am a penny pincher from way back, with The Hubbie in the ministry for 30 years, it was a requirement. Now, cutting back, working toward retirement it is deja vu (I looked this up on dictionary.com. Spellcheck did not recognize it. Gotcha.)
I love Dollar General stores but I bought this dishwasher detergent tablet and it was a total waste of money. Sure, it was cheap, very cheap. The results were terrible. The tablet left a heavy white residue on all of my dishes. Gag. I finally had to throw them away, the tablets, not the dishes. I even tried to wash the dishes twice, hoping a second time would work, nope. The dishes looked dirtier than when they went into washer. I had to wash them by hand, horrible, I know.
So, buy cheap, if it does the job. If not, it's just a waste of money. Buy the name brand that works. In the long run, you will save even if the name brand product costs a bit more. The dishes will not have to be washed a second time, saving time, electricity, water and the price of the cheap tablet.
Live and learn.