I was not able to find (worlwide) ATTINY22L.
These parts are pointed as substitutes of AT90S2343 when running using internal RC osc., but there in no lead time when tring to purchase them :+(
Who have had experience, 2343 hangs (almost 1 time) when powerd, so you need to switch power down and up again to see your program to run, due to INTERNAL/EXTERNAL osc understandability conflict. ATTINY22 is the best workaroud but...Unfindable!
Let me know...