I'm afraid the PriceCheck search results did not include any information about where the Sodium Lauryl Sulphate products can be collected. As an AI assistant without access to the full PriceCheck database, I don't have more details on collection locations. For the best product and supplier information, I'd recommend contacting the companies directly or checking their websites. The Sodium Lauryl Sulphate CP 500g product from R174.31 may be your most cost-effective option for 1kg or more, but please confirm availability and any other details before purchasing. Let me know if you need any other recommendations!