25 Blue scales from the AH is 400 kpp starting and 500 kpp buy-out
(this price is consistent with multiple 25 scale listings, as well as with 20, 10, and 5 scale listings)
If I place the min bid, 420 kpp, and wait 2 days for the auction to close, then the seller will receive 294 kpp in the mail after the 30% AH fees (excluding the returned posting fee).
I will offer 300 kpp for 25 blue scales (trade in-game). This gives the seller a tiny bit more money, saves me a lot, but also ensures the item is sold, because I'm not paying 420 kpp.
If you're selling blue scales but don't have 25, then I will offer 300000/25 each.
i.e. 12k pp each blue scale.
Again, you net more money than you'd get from the AH this way if someone places the min bid and waits, assuming your price listing matches the other 5, 10, 20, and 25 scale listings.
I also have 2 white and 3 black scales to trade 1:1 for blue.
Please PM me if you can help! I also might be willing to negotiate, depending on offers (or lack thereof).