I bring mine inside for the winter because electronics and freezing. If I lived somewhere warm, or even close to warm, I'd simply remove the power once the water was too cold.
If I wanted a dummy cell for maintainence purposes (incredibly rare), I'd build my own for the cost of unions and a piece of pipe if the prefab ones were spendy. The Jandy one is outrageously priced the last I saw it. If I could find a deal one any of them for $40 or less I'd buy it just for ease. Otherwise I'd build it.