R-12 blows colder than 134, but is ten times the price---

Alternative's can be used--but again isn't cheap---

134 you can buy at K-Mart, and if you have the  AC service equipment,
you can do all the servicing yourself, and for cheap---

But---my advice would be to change all the O-rings in the whole system,
(regardless of any information from any witch doctor's that advise to
put a wonder oil in the system,which cause's the 134 to be compatible--)
as well as the dryer---

You'd be surprised at how much cheesy crap is inside the dryer---
Changing it will make the AC system  work much more efficiently

134 runs at higher pressure's--doesn't run as cold, is cheap, and it can
be bought anywhere---

You be the judge---

Later,

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Terry--

       "Zoom, Zoom, Zoom"
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http://community.webtv.net/CTONLINE/TerrysHighOnLife