As far as I know quindecim has not been available in the US yet. Have not seen it thru any of the retailers yet nor has Bill Little ever mentioned it. Mark with Anubias Design seems to have disappeared.
The Wet Spot and Rachael seem to be the most reliable importers to the states. I post whats available fairly regularly here on the forum. Mostly from Wet Spot as Rachael’s supply seems more limited.