There is a “want” for me and a “need”. Obviously a need I am willing to pay more because I need it now. A want I am willing to wait and get a deal, for example a box blade for something like $300 but I waited several years to get one.
Another example, a log splitter, I had one but wanted a better one. I found a used one nearby, a good price so I bought it on the spot. He told me he wanted $800 or $900 for it. Needless to say I gave him $800.
When it’s a “need” I agree with doing your research. For example what’s your used truck really worth. The last truck we bought they kept coming up with a lower Kelly Blue Book value then I had on my phone. My wife finally figure out they had the wrong year for our trade in, due to a typo of course. Yeah right! That saved us $500 when we started to get up and leave.