I know you asked specifically about aftermarket a/c options but if you decide you want to be a purist about it, I have the whole set-up of factory parts.
This is in a valiant and is totally complete but I have no use for A/C and my cousin who is my partner in parting this car out wants nothing to do with A/c, so this A/C set up is getting dangerously close to the squishy farm because I am not going to store it as we bought the parts car for the slant six and the duster front wrap.
So if you want the factory set- up $0.00 plus shipping.