DVD/Blu-Ray Options for "Once Upon a Time"

There is as yet no word on any compilations of both seasons 1 and 2. For the moment, you would have to purchase each season individucally.

Season 1

The complete first season of the show is available at places like Amazon.com:

Season one dvd Once Upon a Time onceuponatimeabc.blogspot.com
First Season DVD cover of "Once Upon a Time"

They also released just the first five episodes on DVD. That DVD is or was only available at Target and might be available online if you look around.

Once Upon a Time ABC onceuponatimeabc.blogspot.com
DVD cover for first five episodes, available only at Target

Official soundtrack was released May 1, 2012.

The First Season DVD and Blu-ray Region I was released August 28, 2012. There are various packages of varying prices. If you wish to review your purchase options on Amazon for Season 1, you may do so here.

Season 2

Season 2 Once Upon a Time ABC onceuponatimeabc.blogspot.com
Season 2 Blu-Ray Cover Art. Note that they have added Hook.

The season 2 collection Blu-Ray/DVD of "Once Upon a Time" will be available for purchase on August 13, 2013.

As the packaging states:

Relive every thrilling moment as ABC's ONCE UPON A TIME: THE COMPLETE SECOND SEASON casts its tantalizing spell. The curse is broken, magic has arrived, and there's no telling what -- or who -- will be unleashed! Now the exiled fairytale characters must grapple with a flood of awakened memories as they come to grips with their new "reality." Old loyalties will be tested, new heroes will emerge and vengeful villains will wreak havoc - including ruthless pirate Captain Hook and the relentlessly wicked Cora. 
Amidst the backdrop of previously unexplored lands and a newly magical Storybrooke, love and sacrifice will set the stage for the ultimate battle between good and evil. For, in the words of Rumplestiltskin, where magic is concerned, only one thing is certain: it always comes at a price. From Storybrooke to Fairy Tale Land and beyond, experience the mystery, romance, action and adventure of ONCE UPON A TIME's remarkable second season. Complete with all 22 unforgettable episodes, plus exclusive bonus features, this must-own 5-disc boxed set is pure enchantment on an epic scale.

The suggested prices are: DVD ($45.99 SRP); and high-def Blu-ray Disc ($79.99 SRP). They are five-disc sets, each with 22 episodes and the usual extras. If you wish to review your options and preview, the Amazon page is here.