Most of the common 2 morph combos(bees, pewters, etc) I've seen have been in the 800-$1500 price range. YB combos for some reason are much less common for me to run across on the web and might be a bit pricier, especially for a female..
Are less common. I suspect it is so because the last decade has seen everyone breeding for Ivories rather than combos -- this seems to be changing .