I'll chime in on this..
I'm certain with the right TD you can get a GF Bathyscaphe. Some TDs actually carry stock or work with other vendors that carry stock. Blancpain in general isn't as popular as other brands/models, so regardless the actually factory status, there may still be some in open market. Just because the factory is no longer around, doesn't mean stock isn't around somewhere.
That being said, ZF probably has the crappiest quality control of any of the producers. Every ZF watch I've had has had some sort of issue, which comes down to their assembly. Maybe you can get lucky, I'm sure there are some good examples out there of their watches, but at the same token, you'll probably drive your TD mad in doing so, that's if you can even make these issues out in a photo, which in all likelihood you can't. After all, it is a rep.
It seems, as far as ZF reps are concerned, they price Blancpain higher than their other makes and models, I'm pretty certain this is because of the quantity than can be sold. That being said, compared to other rep factories, their pricing is relatively lower. You can see this from an average price perspective. Most of ZF reps are sub 400, versus reps from noob and JF are like 400 - 500+. Take this as you may are far as how their trickles down to their quality control.
I can't speak much of GF, as I've never owned one of their reps. But from a consumer/business perspective, sometimes it's nice to buy from an up and coming producer a they have something to prove. It's just like dining at a restaurant, in the beginning of their brand they put so much effort, later on they may get complacent. GF has seemed to push out reps that got pretty highly acclaimed.
From head to head watch perspective in particular with the Bathyscaphe, ZF hands down has the replication better. But in the end, just because a watch is has closer specs/font to it's genuine counterpart, doesn't make it a better rep per. It comes down to fit and finish, and this is where we circle back to ZFs crappy quality control...
