Check the stickies in this section. They lead you to some valuable information that can answer simple questions like yours. The following link describes the different combos of snow and blizzard:
Not sure there's a finite answer to what a specific morph would sell for. Those that are created from readily available stock in a single generation are probably not too high on the totem pole unless they are individually spectacular in some sort of way. I believe higher prices stem from careful long-term planning and breeding - and developing the trust of your peers and a reputation for excellence from a community like geckoforums