Some bigger cities have electronics recyclers and upsellers. Look for them on Google Maps or such. Thrift stores will often have printers, routers, etc.
Best Buy actually has a good certified used section (open box and returns) that sells them for like 20% to 30% off.
My favorite sources are garage sales, swap meets, thrift stores, and storefronts for recycling centers. I haven't had much luck with online sources.
Some bigger cities have electronics recyclers and upsellers. Look for them on Google Maps or such. Thrift stores will often have printers, routers, etc.
Best Buy actually has a good certified used section (open box and returns) that sells them for like 20% to 30% off.
eBay and Woot for off lease stuff. Micro form factor PCs and HP thin clients (t640, t530, t730)
If you want a raspberry pi type of project and don’t need gpio, the thin clients are awesome and usually smoke the Pi these days.
With the cost of m2 ssd coming down as it has, you can get a lot out of these little devices.
eBay is fairly cheap for commodity hardware. Especially the off-lease commercial desktop PCs.
Liquidation auction sites, estate sales, the like. Govdeals or equivalent.
A patient future of regular market monitoring accompanied by ready cash is the best preparation for scoring a lucky bargain.
Basically, you can trade time for money.
There is no website for easy arbitrage.
It also helps to be able to service/repair the tech you want...again trading time for money.
Paying market rate is fast and convenient.
Good luck.