Where to buy?
The official HxC recommend store page is Lotharek.pl as they have different revisions of the HxC devices. Sadly overpriced from 60-100 €, without casing and non-fixable inside your device.
There are also various sellers on Ebay and the price is here swinging around 40 £.
On the other hand, I can also offer these Gotek HxC floppies: (Use Paypal below)
Price: 40 €
Porto within Germany: 4,00 € (Incl. tracking number)
Porto international: 6,20 € (Incl. tracking number)
please include your name and address in the instruction/notes field.