You don't have to spend loads of money to significantly improve your livestreaming setup. This year's Black Friday deals have shaved the price off of some popular accessories that you can use to improve streaming for both you and your viewers.
These are items that supplement a basic streaming setup, which should already include a relatively powerful gaming PC, a solid microphone or headset, and a nice webcam. Some of these tools can be replicated in a much cheaper way, like using a regular lamp instead of a fancy key light, but the consistently good results you get from purpose-made products give you one less thing to think about while broadcasting.
I've ordered the items by importance for most streamers. Obviously the vtubers and Jerma's of the world will probably need a little more than this to fit their endeavors, but most people can get a lot out of something like a capture card or a well-built microphone stand. And everything is at or below the cheapest prices I've seen.
Logitech Litra Glow | USB-C | 2700K — 6500K | 800 lumens | $59.99$49.99 at Amazon (save $10)
Logitech's little streaming light can clip onto your monitor like a webcam and add some brightness to your shot. You can cycle through different color temperatures via the button on the back or create custom presets in Logitech's software. It won't do the job of a powerful key light, but it can make your face much more visible if you stream with a simple webcam overlay.
Price check: $49.99 Best Buy | $49.99 B&H Photo
Neewer GL1 Pro | Bluetooth, USB | 2900K-7000K | 2800 lumens | $129.99$90.99 at Amazon (save $39)
Neewer has its GL1 Pro key lights on sale for anyone who needs to properly light their streaming setup. You can link multiple lights together and