If you plan on buying new parts or upgrading, DO IT NOW.
Yes, I know prices are horrible and inventory is low and you're waiting for a sale. It's not coming. Black Friday is going to be worse than last year.
Hardest hit right now (buy asap)
GPUs and PSUs but other parts are in trouble as well
GPUS
There has been a shortage of GPUS since before last Black Firday, and while it did bring down used prices, used GPUS are actually back at or even higher than they were this time last year. Don't expect the Nvidia 3000 series to cause a decrease, Nvidia is working on a plan to buy the ARM or VIA foundry and someone has to pay for it, there's a shortage of GPUS, there's Covid disrupting supply, consoles are raiding graphics ram supplies and taking up foundry time, people are staying home and need computers and AMD is not a contender at the high end. As a result a basic 3060 is going to MSRP at $500 (WTF) and only go up from there so even if someone upgrades these are so much more expensive that it won't help the used market much if any.
Power supplies...
Same issue as above, Covid disrupting supply, people are staying home and need computers more people staying home needing upgrades. Power supplies take it a step further though as the factories cycle between brands and models, so if you need an SFF by Corsair you have to wait not only for Wall to cycle around to Corsairs line but that specific model. If they've made all they plan for the year, you're sunk. SFF PSUs by the way are one of the hardest hit and my understanding is it;s about to get a LOT worse.
SSDs (there is questions about prices on this, some say down, some say up)
Same issue as above, Covid disrupting supply, consoles are raiding supplies, people are staying home and need computers more people staying home needing upgrades. Thsi happens with any major cell phone or console release.
CPUS
Intel is of course still having fab issues, they were going to have the ARM or VIA foundry work on them but that's probably up in the air if Nvidia manages to buy the foundry. ARM China has been hijacked by the person in charge there so that's out. AMD is also done this way, and while Intel's problems are supply side and self inflicted AMD just simply can't keep up with demand.
Ram (there is questions about prices on this, some say down, some say up)
Exact same as SSDs.
About the only thing you can or will be able to get cheap will be spinners (hard disks) and I'm sure they will come up with some way to jack up those prices as well. It's a dying industry and they want all they can get. Don't expect Black Friday to be good. I told you guys in January it would be new years before things returned to normal, but I'm starting to think it may be middle of next year before everything is back in stock.
Part recommendations for those on a budget:
GPU - go used. A well branded quality 1070 never mined on is a little over $200 and can play almost anything on ultra @ 1080p. GPUS are easy to upgrade later.
CPU - New or used, Intel 7th or 8th gen I5 or better for Intel. Anything Ryzen 2000 (excluding APUS), even 1st gen isn't bad.
Ram - you still only need 16Gb, if possible leave room for more.
PSU and drives - NEVER BUY USED. For ssd, buy at 256Gb for OS or larger, then a spinner if need be but don't go below 250Gb for Windows.
Always verify it works when buying used, and make sure it's brand name, those cheap no name Chinese 1060's and such on Ebay are fakes. If a small volume seller has 50 of a GPU, they mined on it, I don't care what they claim. While some sellers do trade in bulk, these are usually corporate stuff and most offices don't have have hundreds of 1080's. You want the person selling off their gaming rig. BTW, you can get replacement fans off Amazon and Ebay, so even if you get a mining card it's repairable for about $20 a fan.