I would agree with OL1 on the $10is mark for Brightbow - to be honest I would normally have put her lower than that more like $8-10. She as often doesnt sell at all when up for auction as sells at a higher price.
The others in the set are about the same $10-12 for Rainribbon and $10 for Sunribbon but Starbow tends to be a little more popular at $15 for the regular US version.