We have a silver/grey Sunbeam electric blanket. It comes with completely independent dual controls. It has ten heat settings, preheat function (just hit one button and it warms the bed to a nice temperature before bedtime then returns to the level you usually like), and 1 to 10 hour auto shut-off. So you can't leave it on during the day by accident.
It will fit a Cal or Regular King size bed. It's in very good condition. We only used it for about half a season. My wife likes the feel of heavy weight to feel warm so we got comforters instead.
They sell on Amazon for about $120. Here's a link to a similar one although I don't think this one has the preheat function.