Well, seems like he has not been making them for months.. maybe he is using all his spare time soldering the usb copy nes, anyhow.. NeoFlash is coming with one now, and it's not a clone of powerpak it seems, though, that may be a "bad" thing, considering I have my doubts they will make as good mapper emulation as a real nes enthusiast..
So there may be several choices in the future
And my guess is that NeoFlash will be a cheap (and possibly bad though) solution... lets hope for MMC5