A KTOG member posted that he got some DPX and it didn't use the Barnes bullet, it was an inferior imitation. There should be a thread about it that's about a month old. I would buy it in person if at all possible, that way you could make sure it's the right one.
Double Tap loads 380 with the Barnes bullet. They load it hotter than Corbon but they only sell it by a 50 round box for $60. They make some other loads that are cheaper. I've never bought from them but I plan to when I need more carry ammo.