Four Sigmatic are one of the leading USA suppliers of automated mushroom cultivation kits for use in mycological study, research, and various applications. With over 14 years of experience, Four Sigmatic have developed their growing methods and kits designed to get maximum yields. They have a dedicated customer service team and growing experts ready to answer customer queries. All of the jars and spawn bags varieties are 100% guaranteed against any sort of contamination. Midwest Grow Kits offer free shipping on all orders over $99 to the continental United States and discounted shipping rates on all other orders. They also offer wholesale pricing and discounts on large orders.