Hi from Ga. StrayMagnet I don't think you can make a home made one for $69 . A cheap but good wafer thermostat is $24 the the every thing else a cheap pc fan is about $7 . You could buy a little giant for $45 and turn the eggs your self .( 3 times a day) Or keep looking and hope you can find a good used one . but you know how that is.