In the current US military M16A4 contracts, FN's price is just under $700, while Sabre's price is $884. Many of the FN rifles seem to be destined for Foreign Military Sales, while the Sabre rifles will be going to the USMC. Under the same contract, Sabre will also manufacture M16A3 for the US Navy. These will cost $885 apiece. The 'First Article Test' reports for the Sabre M16A3 and M16A4 are not due until later this month, and service deliveries are not scheduled to begin until Spring 2010.
Colt has a contract of their own for M16A4, but it is basically on life support. After winning their award, Colt claimed that they had accidentally underbid ($795 per rifle). TACOM refused to allow Colt to increase their prices, and in response, Colt wanted to withdraw. In order to keep the contract alive, TACOM rolled back the number of rifles on order from 20,000 down to 154.