Congratulations!!!! You've definitely make a smart choice. A birkin is an investment. A blue jean birkin is quite hard to get coz' it's the most popular colour but just try asking and you'll never know you might get one. Green too is nice. My suggestion is to get one in size 30cm or 35cm.
Regarding about the cost, it all depends on the material. As for whether it's hard to get.......yes it is. Many of the ladies here including me have been waiting for our birkins. Firstly is that you must get onto the waiting list but so far the waiting list is closed. However that's not the end of the world. You might be able to get onto the waiting list by being nice to the SA and dropping frequently at hermes' store. It would also help if you frequently buy some of hermes' stuff like its scarves, clothes and shoes. Then the SA might see how serious you are and will put you onto the waiting list. It's not just about being on the waiting list but also on the very top of the serious waiting list. Just do like what I said above........contact your SA regularly and drop by at hermes' store frequently.
Sometimes....good luck do befall on certain women. If you visit the hermes' store ferquently, you'll never know you might find your birkin displayed proudly on the shelves urging you to buy immediately. If you have the time, travel to Paris.....you can easily spot many birkins. There's one lady here which says that she gets her birkin in less than 6 months.
I try not to encourage you by buying through ebay. There are lots of fakes birkins and don't be deceived by the pics. But if you really want to buy from ebay.....maybe other ladies here can guide you into buying the real one. There are also some stores and websites reselling birkins. Websites I can recommend you will be
www.createursdeluxe.com and
www.hermesgalleria.com
However, the choices will be limited.
Good luck on your hunt for your birkin!!!!