Fujifilm Instax Mini Twin Pack Instant Film
You should check out the Fujifilm Instax Mini film! It's a lot cheaper and works for the Polaroid 300 camera (since the Polaroid 300 is just a rebranded American version of the same Fujifilm Instax Mini polaroid cameras). If you buy the Instax film in bulk, it costs around $6-8 bucks a pack which is a lot cheaper and worth it than the Polaroid 300 film, since they are essentially the same film. Hope this helps you out!