The problem with some companies though is that they offer trial subscriptions and later, you have to pay for the trade publications you want to read. At TradePub.com you never have to pay. How it works is that you sign up and the publisher has the sole discretion on whether to send you their publication. However, you don't have to pay a dime for them. They choose specific demographic targets and if you're in that demographic you get the magazine at no cost.
For instance, we are photographers and we own a business. I found quite a few publications geared towards photographers and believe me, I'll be signing up! Check them out for your business so you can get helpful magazines - all free of charge.