As someone who never be able to purchase a birkin direct from Hermes, I am left with: eBay, private boutiques/sales. I know the difference is price is significant, and by all means, if you are able to find a birkin thru Hermes, please do that. 8750 is quite steep for a 35 birkin. I guess, the price if buying direct from Hermes (after tax) is around 7000-ish?
In my city (Jakarta, Indonesia), there are a few private boutiques that have birkins ready to buy, but prices for a brand new one started at 8900 up. Plus, Hermes here have a ridicolous rule, that is, one needs to buy a certain amount of goods first before one can put her name on the birkin waitlist! And, there is only 1 Hermes here. I am real jealous with you guys that live in the US, there are plenty of Hermes there, and you can shop around from state to state trying to find a birkin..
Try to bargain down a bit with the seller. Perhaps tell her that you know the retail price on these bags and her price is def too steep. If you can get it for let's say 7500, I think that's quite good, coz you dont have to wait a minute and can get the birkin just like that..
Good luck..
*Sarah*