(For what it's worth, I'm not sure how we'd make that one work - since brainCloud allows you to link products across AppStores - not sure how we'd be able to establish those relationships in an import).
The good news is that brainCloud allows you to set up one list of products, with multiple price points, across all stores. And then, if you want to change prices (put things on sale, etc) - it's just a couple of quick clicks to do that across all the stores (the new prices would be instantly active).
So we recommend that devs initially configure both a "regular" and a "sale" price for all items.
There's definitely a bit of pain getting it initially configured - but it's well worth it in the long run.
Not the answer you were hoping for - but I hope it helps!