Crutchfield sells the Crimegaurd REC-11 which includes two keyfobs for $70. Add $30 for the two plug-in harnesses (not required, but they plug right into the factory wiring in your car so you don't need to cut any wires), and you have a keyless entry system for $100.
For comparison, ONE keyfob for the factory keyless entry system is $45..
I don't know for sure if Crutchfield has the plug-in harnesses required for a Contour, they have 'em for my '88 Mustang GT...
