The best place to buy a sending unit only would the parts wanted section.
Be sure to list analog or digital dash for the correct fuel level sending unit and if you would like hose fittings or -AN fittings.
Racetronix has a S.S. sending unit with higher flowing hose ends, better electrical connections and upgraded intermediate harness, but is only available new as an assembly with a fuel pump.
That's why I say used is good place to start.
It can be purchased as an assembly through various vendors if needed.
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I bought one of these but you will need a wiring harness. It appears the price has gone up since I made my purchase. But it is stainless so it should last .
I looked at a high dollar one (I won't say the name out of respect for the company) and one from local parts store. Exactly the same unit and $40 less so I went with that one. Came with everything I needed. Thanks!