It is not in their webstore yet but will be soon, I heard this from Sally herself last week.
It is one of those items that just seems to be more and more useful, I keep thinking of new uses for them, many of them quite silly of course.
A few years ago when I was buying 1/48th scale Academy MD-500 helicopter kits to make Little Birds the ones ones I could find were in expensive American made resin conversion sets. I should dig out the Little Birds again as now I can do them properly.