Wow it's cheap, I was looking at it thinking $5 per month for 20gb, that's pretty competitive. Then I saw it was $5 per year! I guess they have the infrastructure to do this and still make profit.
This is linked from the Google Drive app icon in the OS X system tray as "buy more storage".
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Purchase additional storage
Google storage is shared between Gmail, Picasa Web Albums, and Google Docs. You get extra space in all these services, in addition to your current free quota. Learn more
Select a plan:
20 GB ($5.00 USD per year)
80 GB ($20.00 USD per year)
200 GB ($50.00 USD per year)
400 GB ($100.00 USD per year)
1 TB ($256.00 USD per year)
Need even more storage?
Buy 20 GB for $5.00 per year
Store up to 10000 photos from a 5MP camera.
Your new plan will automatically renew each year, but you can disable auto-renewal at any time by returning to this page and choosing the free plan. We will contact you 30 days prior to renewal.
Please allow up to 24 hours for your new storage amount to appear in all services. Learn more
'''
When I following the link you posted I get the new pricing page. It is just taking them awhile to propagate the stuff to all their servers. Give it another ten-twenty min and try again.
Select a plan:
20 GB ($5.00 USD per year)
80 GB ($20.00 USD per year)
200 GB ($50.00 USD per year)
400 GB ($100.00 USD per year)
1 TB ($256.00 USD per year
But in the blogpost it says:"You can choose to upgrade to 25GB for $2.49/month, 100GB for $4.99/month or even 1TB for $49.99/month"
Yeah. I got all excited at the idea of paying $50/year for 200GB. The actual prices are still much cheaper than Dropbox, but not quite as radical as it first seemed.