I just noticed that a tshirt I was looking at on Woot went from $15 to $19. I had been watching the price to see how much it would be discounted next week (typically they can be had for $6 if you order a couple at a time), and was interested to see that the price went up in the last few days.
I realized this is probably happening all over the place and wondered if it is possible to measure the prevalence on a macro level to see which stores/companies/sectors do this the most.
The other thing to watch out for is the "deals", certainly for TVs, are often Black Friday-specific models. Whether this means goods of lesser quality, I'm unsure, but I'd imagine so given the lower price point.