Crosley systems are not made to be serviced and access to the boards is extremely difficult. The power switch is a generic switch that should be available from a number of suppliers (Digikey, Mouser, etc.), but you must match the part from your device. If you can open up the unit and post a photo of the switch you would like to replace, I can point you to a few options.
Also, what makes you think that this switch requires replacement?
Dan