For both Rochelle and Abbey, $20-25 for them loose.
If you don't mind waiting it out, you could price it around $30. As Christmas approaches, people will be willing to pay a little more for what they need and can't find.
The fashion packs CAN be worth some money. The Abbey one with skates, as well as the others from that wave, are not in stores any more so they should be able to sell. The Abbey fashion pack I'd price at $15.
Hope that helps!