It's a pity that people rolling balance druids only settle for "basic bitch" gear, I don't see how you can have any pride in only kitting out your twink to the bare minimum.
As MyPerfection said, those prices are considerably accurate, however the best deals made are OFF the auction house.
Whisper the users selling the items, or if they are offline send them a mail message asking them for 30% off the item.
I'll tweak some of MyPerfections prices to what they go for on my server to provide you with an average value (Sylvanas)
Head - (835) 48k (Could get this to 30k in an OFF AH deal)
Neck - (840) 48k (I got an 840 +socket for 35k OFF AH deal)
Shoulders - (840) 45k (I got an 840 +socket for 36k OFF AH deal)
Cloak - (840) 30k
Chest - (840) 50k (I got an 845 for 40k OFF AH deal)
Bracer - (850) 40k (No 840s on the AH)
Gloves - (840) 33k
Belt - (840) 29k (There is an 845 for 30k)
Legs - (840) 27k
Boots - (970) 100k (Cheapest I got was 85k)
Ring 1 - (840) Sameed's 25k
Ring 2 - (840) Vastly Oversized 45k
Trinket 1 - (840) Eyasu's 40k (I got an 840 +socket for 15k)
Trinket 2 - N/A (I'm using a 715 Trinket, Cost 1k)
Total Cost CURRENT *Sylvanas EU* = 561,000g
Total Cost WITH OFF AH Deals *Sylvanas EU* = 471,000g
Bearing in mind if you don't use the legendary boots it will save you 85,000-100,000g bringing the total down to 371,000g
So the price range is from 371,000g -> 561,000g