For some this will already be common knowledge, for others it might save you some dollarydoos.
Many stores inflate their prices (sometimes slowly over a month or two) in advance of Black Friday, so they can then discount the new price back to the regular price and label them "Black Friday" sales. It's a bit crap…
You can usually check old prices using The Internet Archive: https://archive.org/, and websites/extensions like CamelCamelCamel (this one's for Amazon).
If you know of other price trackers that are half decent, please drop them in a reply.
That's all, folks.
A tale as old as time