Cards
SD cards
Blank, or loaded with the games you named, then tested before pickup. Tell the shop which handheld it is for, because the card size is not the same on every unit.
Gear
SD cards can be loaded before you collect a handheld. Pads and cases are in the same shop.
Cards
Blank, or loaded with the games you named, then tested before pickup. Tell the shop which handheld it is for, because the card size is not the same on every unit.
Pads
A separate pad helps when two people play, or when the built-in sticks are too small. Ask which pads pair with the unit you are buying.
Carry
A sleeve or a hard case for the commute. A screen film is worth adding if the unit lives in a bag with keys.