normally RnS goes for about $8, maybe up to $12
however, with the rise of the My Little Phony group on facebook, her price has shot up as there are many people searching for one....I would suggest posting there and taking offers
(I would offer you $8 plus shipping if you just want a quick sale - just telling you, you can get more if you make her visible to those searching)
MIB birthflowers, I sold for $10-15 each. same with birthstones. I sold most for $15, may have made some slightly lower when buying multiples from me