You have really nice ponies, I don't know about nirvana prices, and sales around here, since I am trying to sell ponies too.
As far as I can tell Bright Glow is selling on eBay for 20/30€, sometimes bidders get her for a bit less, but never under 15€ and she seems to be quite perfect, so it should stay around that, and maybe more if there's something special about her.