Expand the in-game store.
There are in-game products that are no longer for sale, and good luck finding any related codes, but some players really want them. For example, I really want to buy the country flags skins for my cards; I enjoy flags personally and this would be a great touch to my experience with the game. But they were limited release. And this goes for a great number of other products I don't think will be seen again if for a long time... Yet we can still buy the packs of Historic sets easily.
Rather than outright discontinuing them or waiting for the Daily Deals (if they even show there), just set up another store tab that's an archive of all the products that aren't being actively circulated and post them for sale, whether with coins or gems.
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Skwirl#12034 commented
Addendum: I know the whole gimmick is to keep us tied to the game, but you can still implement Daily Deals by selecting whatever products and give them a solid discount, but you're not left out without the stuff you want to buy if you don't mind paying the full price.