Intel does not sale or replace BIOS Chips. If you have a faulty motherboard you may want to try contact their customer support to replace your board.
Check this link for available phone numbers: http://www.intel.com/support/9089.htm
there is a firm that lists on www.ebay.com.au
that advertises bios chips they sell programmed chips for every board
i am just going to buy one for my dx58so that has never booted
if go to www.ebay.com.au and search under bios chips you wil find him they come from the netherlands
he advertises one type of chip eg for assus but his website has one every board known to man