They are so unique that there isn't a "true" substitute for them. Things like fleshweaver witch and dead fairy can substitute for range, and maybe something like mute stalker or thrall for utility. Other than that, there aren't runes that brings what warlock does to the table
I think with that kind of banked value you should be able to trade for them pretty easily, but I haven't been too in-tune with the market since the transition to DOG
Sad to say, but I doubt you'll even be able to get one Warlock if you have to resort to using non-Poxbox sources. People will expect at LEAST 300K for one.
Yay i got one high warlock! now , should i use dark knight as a replacement for coragh? and i hear that moragen is too squishy.. is it right?