Dropbox's $9.99/month plan is for 1 TB of space, not 100 GB of space. You can also get a year of Dropbox Pro (1 TB of space plus a few other extras) for $100, which would bring the price down to $8.33 per month. Don't get me wrong, Google Drive's 100 GB for $1.99 per month is a solid deal, especially since Apple offers only 20 GB for $0.99, but don't confuse it with what Dropbox is offering. Dropbox at this point only offers two tiers: 2 GB free with the option to gain some extra space through referrals and promos, and 1 TB for $9.99/month or $99.99/year.