here is a basic break down I get a lot of ac units. btw older ones yield more usually
5k btu 10-15 dollers
10k btu 13 -20 dollers
15k+ btu 20-40 dollars
central air units 25-60 dollars
once broken down they contain the following materials prices very by location
steel
electric moter
compressor
clean copper alum rads
#2 copper
#1 copper
#2 insulated wireing
sometimes alum and stainless(fan blades
Freon has a value if you can remove it safely .if not and if you get a lot .contact small hvac people to see if they will drain them for free
I have gotten good at ac units over the years if you have any questions ask
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