You can certainly buy a PC pre-built but you have more control over everything if you build your own since you can choose every piece of hardware. Oftentimes building a PC can also be cheaper. That's all the better with these discounts on different PC components happening on Amazon right now for Prime Day.
This TP-Link AC5400 Triband Gaming router for instance has dropped in price down to $230. That might sound like it's still a lot but its normal retail cost is $400 so this is a huge savings, and if you're a gamer a top-notch router is always a good idea. If this is still a little much for you for a router this is hardly the only option. In fact you can grab the D-Link AC1750 Dual Band Wifi router for just $65 if you don't need one tailored specifically to gaming needs.
While there are a lot of routers on sale there are other PC components on sale too, like a 32-inch S-series LED-Lit Monitor from Dell at just $220 down from $300 or a Toshiba 8TB Performance internal hard drive for $151 down from $204. You'll find a few deals on things like gaming keyboards and mice, some other networking hardware, and even a few monitor mounts too. Keep in mind that these particular deals are only good through the end of day today.