You guys trying to build hardware on your own should definitely look into
https://bitcointalk.org/index.php?topic=177994.0;topicseenAvalon is selling its chips raw! but the package has 10000 chips for 781 btc. Each chip has 285 mhps. AT the current price you can buy approximate 13 chips for 1 btc through the group buy.
The above mentioned thread is finished. But it has links to 3 more group buys : 1 shipment to US, 1 to Phillipines etc.
Also the method to assemble it over PCBs etc is being discussed to be completely open source and being discussed in another thread, whose link is also given in the thread.