You can source all the parts for a OEM air conditioning system, but I believe in the long run it would cost more (unless you get a donor truck and take everything off that and put on yours).
Other wise you can get aftermarket one like
vintage air which sells the gen IV for out trucks.
I personally sourced a whole truck for $400.00, I know I will have to go through the whole thing, but at the time vintage air did not have ones for our trucks (they are new).