This is just a guesstimate, and hopefully someone more experienced will chime in, but here goes!

spider female 1500g - $6-700
Male pastel proven - $150-300 (this will vary widely on quality)
Male fire 200g - $2-300 again, varying largely on quality.

I don't see a huge difference in price range on spider quality. Because of the fact the wide range of wants on spiders. Many like high white, or low white. Busy or reduced. IMO with fires and pastels its much more of a majority on what people like. Pastels, brighter the better, yellow = yay, brown = no yay. Although pattern preference varies with fires, coloration should be light and creamy. Some (a lot I think) prefer reduced pattern fires. If you have to ask "is this a fire" its not a good fire.

This is my observation and opinion, in no way meant to be fact. Hope it helps a little!