Price of SkyDrive

Your SkyDrive Account
Everyone gets a SkyDrive account--well, everyone who's created a Microsoft account, which includes everyone who's signed up for a Hotmail or Outlook.com account. All users get 7GB free storage space, and, if you're a longtime SkyDrive account holder (since before April 22, 2012), you get 25GB free. This compares with 5GB free for iCloud and Google Drive (though if you convert docs to Google format, storage is free), and 2GB for Dropbox. You can add 20GB to SkyDrive for $10 a year, and 100GB for $50. Here's how the pricing compares with the other services: SkyDrive iCloud Google Drive
Amazon Cloud Drive
Free storage
7GB
5GB
5GB
5GB
Add 20 GB
$10
$40
N/A
$10
Add 50 GB
$25
$100
N/A
$25
Add 100 GB
$50
N/A
$60
$50

http://www.pcmag.com/article2/0,2817,2409572,00.asp

Price of Google Drive

Price and Storage Allotment
The free version of Google Drive gives you 5GB of space—but in fact, that's not the whole story. Google in fact provides much more space for free because files you create using Google Docs (that is, in Google's proprietary, online formats, rather than documents uploaded from another format) don't count toward that quota, nor do files shared with you.
But if 5GB isn't enough, you can pay $2.49 per month for 25GB or $4.99 per month for 100GB, and both those paid plans come with bonus space for Gmail (25GB). Other plans let you choose 200GB ($9.99 per month), 400GB ($19.99 per month),