We do not test these products in a lab — we are a research and curation team, and we verify claims against the vendor's own live pricing, not marketing copy. For deals specifically, we do three things: check the current price against the product's recent price history (tools like CamelCamelCamel or Keepa for Amazon, and the vendor's own past prices elsewhere); ignore inflated "list price" or "MSRP" strike-throughs, because a big percentage off a fake anchor price is not a discount; and judge a deal against what the item actually sold for over the last 30–90 days. On categories: the ones that see real Black Friday drops are consumer electronics (dash cams, speakers, tablets, headphones), e-bikes and scooters, and tools. The ones where the "discount" is usually fake are mattresses (perpetually on sale), jewelry and many watches (marked down from inflated MSRPs), and "doorbuster" TVs — often derivative, lower-spec models built specifically to hit a headline price.