The Switch Lite, a handheld-only model, followed in 2019, with an OLED refresh coming in 2021.
It means that you'll have to just check in every so often to see if they've gone live, rather than relying on there being a new code just because there's a new set
A lot of the infrastructure is privately owned, so not only are there no official sources, but the private sector, in general, doesnt like to share their information because its competitive

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Avoid rubber bands for holding cards together since the bands can bend the cards and compromise the card structure