Greetings Derick,
The small 12 oz and some 16oz cans of freon 12 are still available for sale out on the market from those folks that hogged it all up when they heard about the freon ban some years ago. It is still legal for a certified mobile a/c techs to purchase this freon. In accordance with section 609 of the clean air act amendments of 1990. If you have had previous experience with servicing a/c systems in the past but don't have a certification to prove it, then you can go to
www.imaca.org and take the certification test to gain your certification to purchase freon R-12 in small qty.'s
Ebay has many sellers of freon R-12 for a price of course, but the cooling difference does seem to make a difference over R-134
If you are not familar with charging a system or the recycling of such freon nor have the equipment, then it's probably best left to your local shop to do this for you, Ouch, is the cost.
Charles