Songbird Productions has re-released a number of old limited run carts for Atari Lynx recently. These too are limited run carts (not really sure why as it's so easy to produce them on-demand), so if you want a piece of Lynx history, grab them now.
The re-released carts are:
You can buy these from the Songbird Productions Shop.
There's also a new Songbird newsletter now, which will help anyone who had trouble subscribing to the old one. You can find the subscribe link and past newsletters here.