What I have seen and I just got one.
Before trailer Mint $300. That seemed to be the max even as they got more rare.
After trailer shot through roof. $700, $800, $1,000 not uncommon.
They seem to have come down as huge amounts of Replicas are coming out like Korbanth and Roman.
I just picked up a mint, complete vintage Graflex for $500. I was gonna get it at $300 and looking at MR, other replicas coming, etc. I said screw it and it was worth the $200 extra I was gonna have to pay. I got Korbanth's FX Graflex coming as well as two Roman's but I thought it would be awesome to have a real one. $800 no way. $500 okay I can talk myself into that since I have an all real parts set of Macros, Droid Caller, torch, etc.
There are numerous mint ones on Ebay for around $500 these days.
They will likely go up when the film comes out but they seem to be hovering around the $500 mark. Some are going for more and some non mint ones are too but be patient and you can snag one for that.
I am sure some have gotten ones for much better deals but this is what I tracked.
Tom
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The one I mentioned I got for $500 was on Ebay about two weeks ago.
Just FYI
Tom