If you are guest, we offer a guest account at the cost of $5 per day, or $50 per three months (for $75, can be upgraded to include circulation rights). Bring a Photo ID to the User Services desk if you would like to purchase one. You may not transfer your guest account to another user. It will be associated with your name and all activity on it will be your responsibility.
For Lifetime Learners, local high-school users, and others, there are discounted plans for obtaining a card. The above link provides more details.