I understand the nature of supply and demand, but it is sad to see that certain army building CMFs with such high/unjustified price tag now. I started collecting CMF when series 4 came out. By that time, the zombie already costed about $15(that's 400% increased in valve) and Spartan $8 even on Bricklink. I was lucky enough to find a box of series 2 for only $120 at a local toy store and traded many of my Series 2 CMF for Series 1 CMF. Now I am sorry for any kids who must pay high price for certain CMF(for example, Zombie, Spartan, Elf, and Roman Solider). No secret here, the price-jump only causes by the demand of army builder. Anyways, LEGO really hit gold here with their Collectible Minifigures Series.