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EU is way farther out, they are dropping 134, with R12 long history, but in the USA you can still locate R12 around $25 / lb in 12oz cans (old stock).
You might have to do the filling yourself after a shop makes sure your system is not leaking, as many shops no longer have the equipment to fill or recover r12.
Below from a post by Griffiths.
R12
1978-1979
R12, 950 grams or 33.5 ounces
1980 - June 1988
Revised Factory recommendation,
Single evaporator systems R12, 1050 grams or 37 ounces
Dual evaporator systems R12, 1200 grams or 42.3 ounces
July 1988 - 1992
Single evaporator systems R12, 950 grams or 37 ounces
Dual evaporator systems R12, 1150 grams or 40.5 ounces
*before you attempt to charge using refrigerant weights
stated above, always check in the engine compartment for
the factory R12 sticker, and verify the charge using an
R12 Pressures and Temperatures Chart
R134a
1978-1982
R134a, estimated 807 grams or 28.5 ounces
1983-1992
as per TB, 9501, 12/19/1995
Single evaporator systems R134a, 860 grams or 30 ounces
Dual evaporator systems R134a, 1030 grams or 36 ounces
1993 onward
Original Factory recommendation
Single evaporator systems R134a, 860 grams or 30 ounces
Dual evaporator systems R134a, 1050 grams or 37 ounces
*before you attempt to charge using refrigerant weights
stated above, always check in the engine compartment for
the factory R12 sticker, or an R134a retrofit sticker,
and verify the charge using an R134a Pressures and Temperatures Chart
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