For computer hardware, I'm still rocking a dell optiplex with an i5-4570 that i bought used for $200 3 or 4 years ago.
For cars (in the US) I would always recommend used unless the additional cost truly has no meaningful impact to your financial situation. We just bought a 2012 chrysler minivan for a typical price ( I'm sure you can use kbb).
Since it was private party I told the dmv I paid $1, it's not financed so no interest, and if we sell it in 2 or 3 years I should be able to get about $6500. In total, it will likely cost me (loss) about 3500 to keep it that long, that's after some repairs and window tinting.
Had we spent a little more and financed a $15k van, and paid taxes on it, the total cost (loss) over 2 or 3 years would have been more than double, even with less repairs needed.
It's a super simple calculation, what does it cost to buy, what's does it cost to operate, how much can I sell it for in x number of years. The last part is usually forgotten, but it's where depreciation is hiding
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