Are you mechanically inclined? If so, you can do a lot of this yourself.
Also, as mentioned, most of the parts don't cost that much:
O2 sensor = $55-60
DPFE = $50-55
EVR = $20-30
Plugs = $25-30
Wires = $45-55
Air filter = $7-10
PCV valve = $10
I would start with replacing the O2 sensor and fixing the EGR system, since that is what the CELs seem to be complaining about.
If you are not mechanically inclined, get a second opinion if possible.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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