1 Dragons den maps @ 200k each 1 Gem mine maps @ 250k each (Pending) 2 Abyss maps @ 250k each All prices are BO
This is just a guess... but I think people stocked up on them when they came out because it was like almost 2 yrs or more before you could actually do them. Maybe there are more of them, unless they are more likely to spawn than the others. I could be wrong, but I remember people just hanging on to them.