I've helped get several from Dell outlet for neighbors and family, haven't had any major issues. Dell is "ok", that's about it, but no major failures out of the several (several as in more than 20 in about 15 years). Also, any there have the same warranty as new, some have on site so you don't have to send it in.
dell.com/outlet They used to have better sales than they do now. 99% of the time they look brand new. Usually anything that doesn't is labeled "scratch & dent".
There is another site, I've never noticed anything great there, but they are lease returns, often older systems etc. Didn't check on the warranties there.
https://www.dellrefurbished.com/
You have to be careful with some refurbished systems, sometimes it's cheaper to buy a new one somewhere else.
I assemble a new desktop for myself every 6 or 7 years or so, just got the last one done with some leftover stuff from the old system and sale stuff during the holidays, about 2 days before the Intel flaw was revealed. I almost went with the other brand chip, although it's vulnerable to other things. Had I known I would have held off a while, although I don't notice any difference since it's been patched. The other brand required buying a separate graphics card, since I don't game, I just figured I'd stick with Intel and use its built in graphics.
Things like RAM, video cards, SSDs are expensive at this time because of the nnalert craze (RAM is double or more, for example, SSD drives, not so much expensive, just not going down in price as they would normally be, similar price and capacity to years ago).