If you prefer shallows go for it. Nothing wrong with it. I was just pointing out it might take more time to work the hive. But each chamber will definitely be light than meds or deeps. You also may find honey capping is faster since they are working a smaller area (I don't know). If it makes you more comfortable no reason not to (that I can think of).
We use 2 deeps for broods and then meds for supers. They definitely are heavey in the autumn - 70lbs of stores in the upper chamber, the lower a little lighter since it had brood.
Just my opinion (others would have much more experience) -
If that is the only reason I would use the normal med or deep and make nucs up. Up here (and from what I know, everywhere) you are expected to return the nuc to the seller -or- provide your own nuc for the seller to place the frames in. Cardboard nucs seem to be use a lot too.
I think you might run into problems of people not wanting shallow frames - since they will usually end up in meds or deeps.
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