I bought my current router (DIR-825) off eBay. Some people (like one of my co-workers) are scared to buy stuff off eBay, but not me. This thing was half the price of what stores were selling it for, (I paid about $50 if I remember), it was brand new, and the guy had good feedback. If there were any issues I would just try going to my credit card company or PayPal, but I've had the router for years now with no real issues. Been really stable. I also bought a wireless extender, so my wireless not only reaches the whole house, but my back yard also. I can watch TV while laying outside.
So, that's why I decided to hold off getting the AC5300. Because my current router does everything just fine. Only reason I really want the 5300 is to have the latest and greatest for awhile. Bragging rights. Maybe then I can also get rid of the wireless extender.
I also picked up a Radeon R9 290 video card on eBay when they were still pretty new. I saved over $100, plus I sold my old video card to make a few bucks as well. I did have a few issues where my system would randomly shut off out of nowhere, but I didn't worry too much.. being a tech guy I figured it was the power supply not having enough juice since I only had a 600 watt, so I bought a better one and it's been working fine for years now.