Thanks @playdad for these infos,
is it possible for a foreigner to order IPS products by using the websites that you mentioned, or is it restricted to the chinese market ?
I have ordered my Zero from Iamips.com by contacting Run Meng as indicated many times in this forum, but nevertheless a direct online shopping would be nice as well.
the 340 wh version is not even mentioned on the website of IPS, but was available by contacting Run Meng who said that in this case the unit would still need to be assembled for this order. So it seems that certain (standard) versions are prepared per batches and available on stock while others versions, eg. with larger batteries, are prepared unit-wise for each new order.
ordering an IPS product still requires quite a lot of know-how... thanks a lot everybody for sharing your experiences :-)