From my experiences the Pastels are the cheapest visual Morph. I think a lot of it has to do with Patels being created during a lot of other breeding experiments and most people will breed pastels as beginning breeders. Some Morphs will never be cheap as it is a long process to create some of them and if breeders can't make money on them they will stop making them. Also new breeders need to make sure they price around what existing breeders are asking or they could damage the industry.