I have written about trade magazines before. Almost every industry and product category has a trade magazine. The trade magazines are written for people who sell in that category. For example, there is a magazine called Archery Business that covers the business side of bowhunting and archery including trade news, industry statistics, marketing and product trends, new product R&D and business tips. Since that magazine is aimed at retailers and online sellers, this is where the manufacturers advertise –and its where companies introduce new products so you can find the new products before others do.
Take the automotive category. There are over 10 magazines aimed at the auto industry –there is even one for car detailing –that is how specialized these magazines get.
There are also general magazines you might want such as Retail Online Integration that has information devoted to helping online merchants, catalogers, retailers and brand marketers tackle the challenges of selling online.
The largest company that offers the trade magazines is North American Publishing (NAP). NAP also offers dozens of trade magazines aimed at different online and even offline business niches. Some are paid subscription but most are free to qualified readers. Just go to the TradePub Listing Page to see what they offer. They have a magazine for almost every product category you can think of.