I heard this product was discontinued. A shame, because I bought this over three years ago and the battery is still in great condition.
You can only order this version from Alibaba etc.
AlanSmith (2) Eyemoo NXT EPaper S1 (for 450$)
Their online store doesn't work (never got it to go through with the order, because it doesn't allow to ship to anywhere except US I believe). And as of this writing their website and shop isn't even available anymore. [EDIT: it's available again and it even allows to ship to other places now…]