To my knowledge, they are long gone and they are necessary for high HP applications.

I bought out what little stock one supplier had left years ago and have used most of them in carbs I have done for people.

If you already have used .110 seats, get needles from a new standard kit, the needles are usually big enough for a .110 seat (or even larger). Also, you may get away with lightly used standard needles if you have some that are in good shape because the contact circle will not be in the same place.