In the NYC Hermes where I shop, there is no longer a waiting list, so you get what they have on the floor (unless you are a VIP, of course). I believe the bicolour, vibrato and any fancy variation other than a single color togo or box costs about a $1000 more. For example, I saw a vibrato 35 for $8,100. I believe the usual price for a single color plain leather is around $7000.
I have been there at least 7 times in the past month, and I saw only a 35 orange vibrato in chocolat box leather, a chocolat box 40, and a bicolor chocolat cyclamen in 30 (which I purchased). The orange vibrato was there when I called last Wednesday. It could still be there. Several ladies have looked at it while I was in the store but no one bought it. I will look for you and let you know if I ever see one. I go often, since I am determined to get a 35 birkin in a solid color!
Also, some on the robbe report message board told me she saw a gold 35 and bought a black 35 while i was away on a business trip. Darn! You snooze you lose! I wish I still worked in Midtown Manhattan, so I could go into Hermes 3 times a day!