I recently bought this Schrade Camp Knife (SCTSCAMP4), and have had the Marbles Utility version (MR278) since January. These are current imported productions of the discontinued Camillus Camp Knife, with something like 10,000,000 of those produced, maybe more if other manufacturers like Imperial were included(Bladeforums thread with info), but are no longer produced by any US companies, as far as I know. Used U.S. produced versions can still be found on ebay, and prices vary depending on condition and rarity. Camillus is still in business, and I do wonder if they'll bring out a new version of the knife, but I'm sure it would be imported like most of their current offerings.
I've never owned one of the US produced versions, having seen and handled more with broken springs than without. I looked through a box piled full of them at a gun and knife show one time, and every last one of them had broken back springs, and then I noticed the box was labeled as 'scrap knives'. The guy at the booth said a lot of old timers liked to buy a few of them and take them apart and put together one good one.