GMAT Strategy

I have been unable to find Kaplan 800 at a bookstore near me. I take the GMAT in 2 weeks and have limited time to study, and even less time to look for Kaplan 800. At this point, ordering it would take too much time. I've finished OG 11 and have found the last section of quant (the most difficult bit) fairly easy...I thought I'd buy Kaplan 800 to try and raise my score a little more. Everyone seems to consider Kaplan 800 essential for a high quant score.

Am I at a serious disadvantage if I don't use Kaplan 800? I'm aiming for a quant score of 45-47. I received a quant score of 47 on my last GMATprep practice test..obviously if I can score even higher, that would be a really nice bonus. Are there any questions available online which both mimic the difficulty level of Kaplan 800 and the authenticity of the GMAT questions? I don't really have the time to go hunting for anymore books, so online resources are the best.

The only one I've found so far is the "Difficult Problems from the Math Section" document on the Beat the GMAT Wiki as well as trying to solve posted problems on this forum.

Thanks for your help!