I would consider discus to me intermediate to difficult depending on the keepers goals. As for prices, it seems to me like much of the cost is based on which breeder the fish comes from. A high end breeder with notariety for quality fish can demand higher prices for say a pigeon blood than someone else if they have some awards to their credit. If a breeder gets "best in show" discus at the ACA convention for example, people look at that as "I want fish from that guys stock" ($).