Try these: www.freeze12.com-This is good for a temp-pressure chart.Freeze12
is a blend, so b careful.   www.Ebay.com--search for freon--about 200 lots
of everything for sale.Get an education at this web site. One must have a
licence ,or sign a paper saying that this purchace is for resale,to buy
here.They even have the licence test for sale-$6.Take the open book test
today, buy freon tonight. Currently a 12 oz. can of R-12 goes for $20,
maybe a little less, and cheeper by the dozen.Lots of 4 cans (48oz)about
$75.They got Macfreeze, Freeze12, 134a,r-12 r-500,r-22,r-anything you
want.Hoses , tanks, recycle equipment ,ect.