Anthony, I don't think you are under pricing parts. The people on this forum are in a unique position to still be using products that the rest of the automotive world seems to consider obsolete and undesirable. When a product/part they are looking for comes up for sale at a "fair" price, it gets sold.
The past 4-5 years, I could barely get $10 for a can of R12 at swap meets around here and, usually, brought most cans back home. The demand for it has diminished with widespread use of aftermarket A/C in restorations and resto-mods requiring R-134a.
Speaking of R134a, it has already been replaced in many new vehicles and will be phased out of all by 2021. The cost of the replacement refrigerant makes the price of R12 look like a steal.
R134a has come under EPA licensing regulations and I was told, last June, that I needed a license to purchase it at one store. I went to a different store and bought their last case of 12 cans.
We'll all be stocking up on that next....
