Cerreta Candy Company has a factory in Glendale, Arizona. They offer two free 30-minute tours Monday-Thursday, the first one at 10 am and the second one at 1pm. They also have featured specialties daily.
When my friend and I visited, we happened to miss the tour by half an hour. We saw some folks at the end of their tour. There were some children finishing up making their chocolate pizzas. I was looking for toffee for my sister, but that happened to be the featured chocolate of the day, so they were completely out. The only toffee left was the sugar-free kind, and my sister and I do not like sugar-free products.
I ended up buying a few camelbacks (their version of turtles) and a few chocolate bars for gifts. Next time that I'm in Phoenix, I'll make sure that I visit in time for their tours, now that I know the schedule. They also sell their candy through mail order or online. Their phone numbers are: 623-930-9000 or 623-930-9085 fax. Check out their website.