I bought 2 of them earlier last year from jandaman.
It's ZTNET that makes them now, but they don't seem to have manufactured any more since then.
Anyway, it's either ZTNET or eBay, tough I wouldn't get my hopes high on ZTNET making them again... Maybe if many people ask they may do another batch, but they seem to be very unreliable.
So yeah, if you see them on eBay go for them, because that may be the last chance to get them.