I believe the US has protections against deceptive pricing like that too, but i don't think any of these companies or practices described in the article would b

I believe the US has protections against deceptive pricing like that too, but i don't think any of these companies or practices described in the article would be in violation of it. The law you're referencing is a protection against raising the price before a sale so you can advertise the sale price as x% off the inflated price instead of the store's regular price. Most e-shopping sites advertise a discount relative to MSRP, not relative to any price they've previously charged, which leaves them free to raise or lower the prices as they want.