I was recently looking for a gallon jug of WD-40. I still use it for some things. Mostly in Aerosol cans purchased by the case, and I was thinking they stuff still works as a decent cutting and tapping fluid for aluminum. At the most expensive source its about half the cost of Tap magic or Rapid Tap. Both of which I buy in gallon jugs. McMaster and MSC are where I usually looked first for things like that, but if I happen to have a current discount code from Zoro I check there as well. Imagine my surprise to find Walmart had gallon cans for the best price. Well 68 cents cheaper on eBay, but if I buy two cans shipping from Walmart is free.
It got me thinking. What other industrial products might be cheaper/est from WalMart. Often with free delivery.