Here it is!
http://www.amazon.com/Naturally-Sadie-Charlotte-Arnold/dp/B00379AHA4/r ef=pd_ys_qtk_rnr_24
The problem is, this is a "Best of" box set, which means it has a limited number of episodes, and the "Best of" description itself is quite subjective.
Its already out.
The release date said "MAY 11, 2010."
I don't think it's season 1 though cos it has Shenae Grimes on the cover (to obviously cash in on 90210) and she was in season 2 and 3 so it's best of from the whole series.
The DVDs are also being released in Australia and I think this might be season 1 but in different volumes. The first part is already out and is titled 'Forest For the Trees' which is a season 1 episode title and the runtime is 135min so that's approximately 6 episodes. The next part is coming out in September and titled 'Best of Enemies' which is also a season 1 title.
http://www.ezydvd.com.au/item.zml/812830
http://www.ezydvd.com.au/item.zml/814541
Can't wait to get these!