The rifle looks like it will land in the $10K to $11K area.
Casings are $50.00 per , no firm price on the bullets yet as they are still in the development stages. The larger the run of bullets being made the better the price will be, but given the cost of the material and the machine time it would not surprise me to see them run in the $20.00 per bullet range.
Pulled Vulcan practice bullets can be used and are significantly cheaper but will not begin to compare to what the custom projectiles will do for accuracy and distance capability.