So my wife bought me a Craftsman 3 ton jack about 3 years ago for my birthday. I noticed that it been "leaking down" on me here lately and my dad told me that i can order a kit to rebuild it from sears, so i went to the "parts direct" website and they only sell the "power unit" as a whole unit. Well that fine and dandy but the part is $112, you can by the jack for $80. So are jacks a "disposable item now????? 
http://www.sears.com/shc/s/p_10153_12605_00950139000P
http://www.searspartsdirect.com/partsdirect/part-number/950139-07/0009/875