Well 10th seems to be out of stock at most book stalls too ... I presume you are talking about the Original print. But there are these photocopied-spiralbound-avatars that are available. An original might cost you 1400 or so .. but this comes at about 400 odd. Also, the original is mostly never bought-back by the store, whereas they are mostly willing to take back the pirated copies ... though I dont see the logic in that!
Availability ... I faced some problems too ... but I was promised by most stalls at Koti (hope you are familiar with the place) that they could arrange it within a day (pirated copy). And personally I have no qualms using a pirated copy ... ppl can choose to differ with that.
But moi the impatient types ... so I just hooked up with some pals and took one copy from them as soon as they were done with their test ... I should have been equally eager to read at least the first page of the book ... but I havent done that yet !!! All I had to offer in return was some essay editing services ... not to mention ... havent done that either

... not yet atleast.
But IMH study plan ... OG figues towards the end. I agree it is a bible ... but you better get ultra-super-religious first to be able to get the depth and breadth of concepts like GOD and the nature of human life. TRANSLATION: Learning tricks and tactics from OG has two drawback:
# Its too unstructured to be a great way to learn the approach we need to take towards problem types. Which is best done by more structured and somewhat advanced books like Kaplan. So you get the approach from there and fine tune it to what ETS is going to throw at you using OG ... again ... this is my impression from reading high-scorer opinions ... I havent used OG yet.
# You are already done with your most imporatnt practice material.
A 790 scorer, TwinSplitter from the TestMagic forums quotes another guy in his post saying ... Kap. is like an athelete training at altitude so that the real thing is easier by comparison. And I tend to agree.
But my issue right now is beyond getting books ... I am just not giving time to my prep ... all I am doing for GMAT is disbursing gyan at forums ... if anyone has faced the work-gmat-timebalance issue and has some pointers ... plese share them here.