Around 2010 or so I used to buy the cheapest tubes available for my bicycles and had been doing that for decades. No real problems. Then I started to have weird flatting issues where the tubes appeared to just fail after some short length in service. I was buying at Walmart and Target at the time. I stopped buying there and bought much more expensive tubes from a bike store. This cured my problem. I guess the race to cheapest left out the reliablity in those cheap tubes. I now use Schwalbe tubes. I'm getting very good service from my tubes now.