I bought some of the parts last year and some this year

Compressor (Denso Factory Remanufactured) $395
Expansion Block/Valve (the Eghoff from here) $22
Receiver/Dryer $50
High and Low preasure switches on $16
Temperature switch $18
Set of new O rings for all of the hoses. $17
New Aux electric fan (ACM brand) $90 ish
Mineral oil 4 - $6

3 Quarts of flush at $39 each

3 LBS of R12 at $60 per lbs. This is where I chickened out. Could have saved some $$ by getting certified and doing the charge myself. The shop sells the R12 for what they bought it for.

So its a bit of coin to get it going with the worst offenders being the pump and the R12. The old fan was making a racket while running so if yours is good then you can save there.

Hurts a bit while spending the $$ but with the dark brown interior and a hot day in the sun at the parking lot at work it beats a sweaty back after the commute home.

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Current
1989 300SE - Siegfried
2010 Toyota Tundra Crewmax
2005 Honda CRV

Gone but not forgotten
2001 F150 Supercrew - The Screw
1966 Ford LTD 390 - The Big G!
1995 Mercury sable
1986 Subaru DL
1982 Ford EXP - my first car