I have two sulcatas that are just about ready for an enclosure upgrade. I have already built the new enclosure, it is 8'x8'. I had already bought about 6 large bags of "organic" top soil thinking there were no additives in the soil. I start dumping everything in and low and behold there's fertilizer in the soil. I Tried to find a different brand, but all the ones I've found have fertilizer (they have started calling it organic fertilizer now) or some other kind of additive. I didn't think getting just plain dirt would be the hard part of building a new enclosure. So my question to everyone is this: what brand of either top soil or potting soil does everyone use in their substrate mixes? I want to find something I can buy in bulk since the enclosure is so large, and I want to avoid anything that's labeled as for reptiles since the price becomes so much higher.