$7,500 [S1] at the vendor, up from $2,500 [BETA]. That price rise is in the official Season 1 changelog.
It ships with 1,250 build supply, 100 each of fuel, ammo and parts, and a small and a medium hammer. There is no large hammer inside.
The Large Hammer is Support 8, with a $75,000 [S1] blueprint and $2,400 [S1] per buy. You need it for the L81 mortar, the Talon SAM and everything else on its build pages.