Final answer:
Add/drop slips are usually available at the registrar's office or academic advising office, and sometimes at informational booths in high-traffic areas like the Student Center during specific events.
Step-by-step explanation:
If you are looking to pick up add/drop slips on campus, these are typically available at the registrar's office or the academic advising office. These locations are the main administrative hubs for course registration and changes. Given that you have mentioned learning about the survey collection being conducted in the Student Center, this high-traffic area might also be a place where informational booths are set up during specific events to assist with registration processes including add/drop forms.