I personally think Derlin's fate was dealt him more because Hasbro decided to make a figure that not only had a bit of dullness to him but he also just didn't "wow" you out of $7 when you look at him. Case in point, he shipped seemingly equally well with General Veers... Veers is equally boring though, let's face facts. However, somehow Veers outsells Derlin... I think while fans want both figures for different reasons that drive collectors to buy all the time, Veers was the better POP sell than Derlin was... Veers came with "stuff". Derlin came with a gun that's so small you could barely make it out in the packaging.
Both are equal figures but obviously Veers outmatched Derlin by a hefty margin for "stuff". And as such it seems Derlin sits and Veers sold slowly but steadily. We had walls of Veers till the TRU sale... After that he sold steadily everywhere else too. Now I don't think I've seen one in quite a bit actually. Derlin I see, but not to the extent I used to, and I'd say only at Target too... He's long gone everywhere else.