What exactly are you turning on/ off? If it's just DC powered stuff you could do it very cheaply with an Arduino (without having to code using Maxuino) and a very simple circuit that uses a transistor as a switch. I'm sure theres something you could do with AC stuff but I wouldn't mess with it!
Attached circuit, just replace solenoid with your DC item, power with your required power source and PIC output would be a pin from the Arduino.
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