Here is one available for pre-order at Fangamer:
https://www.fangamer.com/products/citizen-sleeper-physical-game-nintendo-switch?utm_source=Fangamer+Newsletter&utm_campaign=123a522a20-EMAIL_CAMPAIGN_2019_04_18_09_37_COPY_01&utm_medium=email&utm_term=0_dd0d1abd00-123a522a20-10953970&mc_cid=123a522a20&mc_eid=efeac2202e