I've finished my organic cotton that comes with the subtank mini. After speaking with my local vape shop vendor, he told me uses organic cotton balls sold in a big bag and can be found at an organic grocery store. I'm not sure what country it's from but I'm thinking about buying this cotton or the sandwiched squared organic Japanese cotton that can be bought on Amazon. Which cotton would you recommend for wicking coils? Do they both work the same or is one better than the other? Where else can I buy organic cotton?