EDIT: So apparently I can let individual users buy individual Google Drive storage at the prices listed in this post (and listed here: https://support.google.com/drive/answer/2375123?hl=en).
But as a Google Apps admin, if I want to buy licenses and manage them for our users, I have to pay these prices: https://support.google.com/a/answer/1726914
$9.99/mo for 1 TB if the user buys it for themselves.
$89.00/mo for 1 TB if the Google Apps admin buys it for them.
Google, this is stupid.