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Black Friday not the cheapest time to shop, says consumer group
(www.theguardian.com)
This is a most excellent place for technology news and articles.
Most items, especially large ticket items, have an annual schedule where new models are releasee and previous models are discounted to clear the way for the new ones. Just google the type of product you want to buy to see when they are discounted most.
Camel Camel Camel is pretty good price tracker too.