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I've never heard of Sphagnum moss bricks, but you can get bags of the stuff at the Lifestyle nursery. U just need to soak it in distilled water for 24hours.
i think they were fairly cheap, about R20 for a few hundred grams. The stuff is really light. I can't be 100% sure because i dont remember but i do know it was great value for money. I didn't think twice about buying the bag.