Pregnancy tests (임신 테스트 or 임신검사) are widely available, and can be purchased by anyone.

Online

The best deals are found through online shopping. The fastest option is through Coupang's 로켓배송 (Rocket Shipping), which provides free next-day delivery for orders over 19,800 won. Rocket Shipping orders beneath 19,800 won are charged an additional 2,500 won for shipping, so you may as well buy some other stuff, too. Some ideas for qualifying for free shipping: bottled water (생수), spaghetti (스파게티), toilet paper (화장지), or more pregnancy tests.

A search for 임신 테스트 will bring up several results. Expect to pay around 6,000 won for a 3-pack of plastic test sticks, or a 10-pack of paper strips.

Pharmacies

Pharmacies will have a wide selection of brands and prices to choose from. The pregnancy tests are usually displayed somewhere on or near the counter.

Daiso

Many (but not all) Daiso stores carry two kinds of pregnancy tests, and these are always displayed on the cashier's counter. The tests cost 3,000 won and 5,000 won.

Convenience Stores (7-11, GS 25, etc)

If in stock, tests are next to the tampons and pads, or in the medicine case somewhere near the cashier.

Marts

Big marts such as Homeplus may have tests next to the tampons and pads. These marts also have a pharmacy somewhere in the building, and the pharmacy probably has pregnancy tests available. Smaller neighborhood marts are unlikely to stock any tests.