Most auto supply stores, Walmarts, & KMarts sell A/C kits for $25. If you need another can of R134a, they are about $4-5 each.
The kit should look similar to 
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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