These cards are not available any other way as of this writing. Here are the 3 promo cards you get inside Yu-Gi-Oh! Legacy of the Duelist: Link Evolution: Progleo, Micro Coder and Cynet Codec. The suggested retail price of this game is $39.99. The promo cards are exclusive to the physical version.
There is also a digital version of this game, but I have no idea why you would invest your money in the digital version, because you don’t get the free promo cards with the digital version. We are having a look at the Physical Copy of Yu-Gi-Oh! Legacy of the Duelist: Link Evolution – for the Nintendo Switch.
Yu-Gi-Oh! Legacy of the Duelist: Link Evolution – Nintendo Switch Box Art