This is a summary of the Flash/SD cartridges available for the Lynx. These allow you to play ROMs from an SD card, on your Lynx. The latest information is available on Atari Gamer here - SD/Flash Carts for Atari Lynx.   There are links to various online stores where you can purchase the kits from here: https://atarigamer.com/pages/sd-flash-carts-for-atari-lynx#sdcarts   The comparison is meant to be non-biased. Feel free to share images of your carts in this thread.