That is a shame; I have to admit that I've looked at Yellow Aircraft several times in the past but, whilst it's possible to get them in the UK, they're not readily available so never got round to it.
Are you able to give an idea what you have left in stock? I guess that they'll be a short term spike in interest as it finally hits people what is going on
I assume that as parts are still being supplied that all the rights will stay with Yellow Aircraft, so there's no chance anyone else might take up the line?