Single / One Time Use / Disposable logins (user accounts)

Wondering if anyone knows of a way, or a module to let an administrator create user accounts that are "Single Use".

Meaning... I could create a bunch of accounts in advance, give john doe one of those login credentials to my site, he could log in Once and browse around and buy some stuff.

After his session expires or he closes his window (I have session length set to zero), that user account cannot be used again.

It's a temporary, one-time-use user account.

Idea is i have a stack of business cards, each one with a unique login/password (for the accounts I pre-created), and I can hand them out to people for a "one time use" on my site.

Searching the forums is tough because everything around "Single login" or "One Time Use" refers to the initial login link sent to users when new accounts are created.

As always, thanks for any advice you have to offer.