There is a loyalty discount for owners of any of their products as far as I know. And I must say if Pipa is on the level of their Upright Bass (which is so damn good), then it must be the best one.Good to know that owning Ample's upright bass gives me 10% discount for their Pipa.
I tried membranes from different companys.They usually made of reed and are very cheap（1$ is enough 1year).The challenge is to appropriately paste it.Menbranes are fragile.And paste too loose or tight both make Dizi sounds bad.TCB, thanks so much for your input -- it reinforces which references are accurate (if incomplete) and which are not, amongst the sources some of us found out of desperation to learn more about these instruments. And it also adds a lot of first-hand knowledge that helps even further.
I did find with that one link I posted, that gave good descriptions of several of the "voicings" within the Dizi family, that they are highly affordable, even for good quality, so I may order one, once I decide my preferred initial voicing. And thanks for clarifying that the membrane is common vs. rare, as that wasn't clear from some sources and I think not all libraries included it (i.e. the ones that are too "clean" sounding).