here is a recent WTB ad for HO52 no spin
WTB HO52/HO72 Posi
complete axles and no spin third members range $250 - $500 from what I've seen..
I bought this HO52 no spin third loaded with 4:10 gears for $250 delivered thanks to good friend..
the no spin diffs are no longer manufactured so it's more a seller's market..
there are axles swap options but they aren't necessarily always cheap either..
and the purest will prefer the factory Eaton anyway..
as for the Dana 60, there are certain years and axle splines less desirable but late 60s I believe are wanted..
again though, depends on the buyer's application as to what they'll pay..
I bought this 66 D60 4:10 limited slip, colloquially known as posi, leaf sprung axle drum to drum for $400 in socal..
hope that helps, good luck!