Slideshow: SIGNAL Food Stores Modernizes for the Future Take a tour of Missouri c-store chain SIGNAL Food Stores.By Isabelle Gustafson | July 8, 20195. Selling CBD After the Agriculture Improvement Act of 2018 passed, better known as the Farm Bill, SIGNAL started selling cannabidiol (CBD) products from Hemp Bombs in all stores, including oils, rubs, gummies, pet treats and vape products. Pages: 1 2 3 4 5 6 7 8