About 60% of surveyed online grocery shoppers who subscribe to the service bought groceries from Walmart during the 12 months ahead of an April poll by Coresight Research.

We witnessed companies offer plenty of these faux markdowns during the last two Prime Days —from Expo dry erase markers to a giant ice tub. If you see any discount that promises more than 50% off, you can all but guarantee the real sale is probably closer to 10% or 20%.