I breed my own, so I have no clue. I wouldn't buy a tourniquet from Petco if my arm got cut off, so I can't help you there, either. I guess you might ask at the store you'll be buying from what their prices are.
Switching from live to F/T can be as simple as skipping a feeding or four and then offering F/T on tongs. Sometimes switching from live, then to freshly prekilled for a couple feedings, then to F/T is more successful.
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