What reputable business would not be able to give you an estimate of when they'll have the chips, that's just absurd. Are you guys using a 3rd world sweat shop or something to pump these things out?
Answer: a small boutique fab. You know, like the one Inaba boasted BFL was using because small boutique fabs supposedly offered a much better, more personal service than the mass-produced crap from companies like TSMC.
Come on dude, all your ASICS do is SHA-256. That's not rocket science.
It's very easy to make it complex, though - for instance, by insisting on doing a full custom design even though that increases the costs and risks substantially without necessarily improving speed or power efficiency.