is there a card reader for the 2023 macbook air

this >> LENTION USB C to SD/Micro SD Card Reader, Type C SD 3.0 Card Adapter Compatible 2023-2016 MacBook Pro 13/15/16, New Mac Air/iPad Pro/Surface, Samsung S20/S10/S9/S8/Plus/Note, More (CB-C8, Silver)

or this >> USB C SD Card Reader, CF Card Reader 3-Slot Memory Card Adapter for Type-C Device Supports Compact Flash Card TF Card Compatible with MacBook Pro/Air M1 M2 iPad Pro Android Galaxy S21 S22 S23(White)

and there are many others to be found at the links already provided by me, or the one @Servant of Cats supplied.

yes, just look for ones that have an USB-C connection and there are many affordable ones available.

Here's a portable one – about the size of a thumb drive. It has both USB-A and USB-C plugs, and supports USB 3.0 speeds. I'm sure that if you look, you can find many more.

https://www.amazon.com/Vanja-Reader-Adapter-RS-MMC-Windows/dp/B07MBD66GZ

there are many to be had on amazon.

https://www.amazon.com/s?k=mac+card+reader&crid=3U6WD90OGQ0Q2&sprefix=mac+card+reader%2Caps%2C96&ref=nb_sb_noss_1

Depends what kind of card you. wish to read. Flash memory card? Common Access (security ID) card? Credit card? Optical, magnetic, or chip?

There are too many variables, you need to refine your question