Yes, the Built to Serves are a limited edition. Ram did five releases for each branch of the armed forces. Ram offered two colors per release, one regular color from their line-up and one low volume color. The number of units produced per color, per release varies, but it’s been about 1,000 units each.
Ram did one release at a time, and once the total number of units of that release are produced, that is it. The colors aren’t available anymore. Currently, dealers have the Flame Red and Tank units on their lots. Some still have trucks from the previous release which was Billet Silver and Anvil. The final release is the Coast Guard release which will include Bright White and Spitfire Orange. You might still be able to order a Bright White unit, but I don’t believe Spitfire can be ordered anymore. The coast guard release has the lowest production numbers of all the releases. These trucks haven’t entered production yet, but should be fairly soon.
If you were looking for any of the initial colors (Gator, Black, Ceramic Gray, or Patriot Blue), those are no longer available.