yeah, here in oz I've only ever bought one 48 pack that weren't splittable. They're out there, it's all luck really...but most packs still come apart easily, like alpha said it takes less than a minute easy to do a sheet of 12...i just threw out the pack that wasn't splittable.
btw, the first time I took 300mg codeine I had quite a considerable itch - I'd only taken codeine twice? three times before that at much lower doses. working your way up is a better idea...taking 450mg off the bat would give you an itch annoying enough to make you wish you had antihistamines. of course, if you do, go for it, but be safe.
I went through a period of codeine binging because of the ease of getting nurofen plus and the great synergy with ganja...i'm so glad I've never had a good hydrocodone or oxy supply