very chemist or drug store has a section with contraceptives. Sometimes it is near the pharmacist and included condoms and sometimes it is in the feminine hygiene section along with home pregnancy test kits.

As a teen I had a rule: I would buy the stuff that goes in me and he would buy the condoms. We shared the responsibility. Surely, your girlfriend has seen these things. Based on your several posts I suggest you and your girlfriend have a good talk with a school nurse, Planned Parenthood, an older sister or whomever. You need to know what you are talking about before you use it.

Spermicides (gel, jelly, foam, suppository) are not sex toys. They are the real thing for a real purpose and you better know how to use them.

walmart, cub foods, target, just about anyplace with a pharmacy

whats a Save-on?
I just figured you found them at Pharmacies or Walmart or something.
I know I've been at walmart and seen the spermicidal inserts.