I've been collecting fountain pens for quite a while and there is only one place to get the best deal on new pens and that is from Chuck Swisher at Swisher Pens. He's an authorized dealer and has the best prices on everything. I would recommend that you look at Pelikan pens as well. They are German made, just as well made and less expensive. Don't get me wrong, I have about seven MBs and I love them, but Pelikans are just as nice and I have a few of them as well.
http://www.swisherpens.com/