In the capitalist craze that is "Black Friday" (now expanded to "black week" or even "black month" in some countries), the occasional deal does pop up that would make even us reclusive gamers reach for our wallets. Shopping online enables us to get our fix without ever leaving the comfort of our own chairs; no looking for parking or fighting over the last product on the shelf. We can have a look at some of them and, by all means, feel free to post links to other deals you might find out there.
GOG.com is a shop I heartily recommend, and on their sales page there are several gems you might be interested in. Firstly, if you haven't played "The Witcher" series yet, you have missed out on something. W3 is (in my opinion) the best RPG ever made. Take a look and buy them if you can; I also recommend getting the W3 expansions, especially "Blood and Wine". Another favourite is the enhanced editions of Baldur's Gate 1 & 2. At these prices, it's a complete no-brainer. Oh and if you're into older games, the "Quest for glory" series is really cool. Anyway, there are lots of gems on GOG.com, all DRM-free and playable on modern computers, of course, enabling you to go nuts and shop to your heart's content.
Steam also has many items on sale, including the FarCry series, the above-mentioned Witcher series, XCOM 1 and XCOM 2 (both of which I can recommend), Elder Scrolls V Skyrim, Civilization VI (currently selling at -70%), Borderlands 2 and much more besides.
Amazon.com have lots of PC/game stuff on sale, there's a good chance to pick up some equipment there if you're looking for something.
Of course there are many more shops out there, and many more deals, just keep in mind that you should not splurge for splurging's sake - shop for things you want or was going to get anyway ... Happy shopping, and don't ruin yourself. :)