Hi, I always use a mix of ferret food, as you never know when a brand might run out or you can't get to the specific store for it. I mix bags of either Vitalin - which you can buy on line quite cheap, or the EquineCanineFeline website is quite good for ferret food, I get a couple of different bags, then mix with a high quality kitten dry kibble, my lot have squirty bums if I use Chudley's but it's just down to the individual ferret. We also have a local pet store who buy in James Wellbeloved, so we just buy a bit here and there, as long as it's not in a fancy bag we get it quite cheap.
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