Marketing products are customized merchandise that you might brand with your companies logo or brand to increase long term visibility.  If you have a business running a lemonade stand, for example, you might sell custom mugs or glasses that have your lemonade stand logo on the side of the cups.  If the cups are nice enough and fairly durable, this could actually be an investment in long term advertising and marketing, because the branded products will be able to increase exposure for your business for a long time to come.  If you sold about 100 of these marketing products every day, after a few years this would be a formidable amount of branding that you have put out there to your customer base.

Now if you just take a bunch of tee shirts and slap your logo on them, you might not get the results you want.  It all depends on your company and what your core products and services are.  Let's say you run a lumber supply store.  Instead of branding tee shirts, you should brand your equipment instead.  Promote your brand to the people who matter by putting your logo on the equipment that will do your advertising for you.  That way you can increase exposure to your target audience and have other construction workers and builders.  The question is not "How can I advertise to the masses for cheap?"  The question is "How can I creatively increase exposure to my brand among my target market?"  You should not try to sell to the whole world, but instead you should try to find ways to focus in on your target market, or the people who are most likely interested in your products and services.

Now if you happen to be in the business of running a website and trying to increase your traffic to that website and thus build your brand, then you might be interested in purchasing internet marketing products.  These are typically services on the internet that attempt to teach you how to drive more visitors to your site, and might also include some online tools for helping you to do so.  Prices might range from only a couple of dollars right on up to several thousand per month.  This is a somewhat shady industry because it is basically part of the "make money online" arena and so there are a lot of self proclaimed gurus out there that are trying to take advantage of newcomers.  In most cases it makes sense to start with an action oriented approach to internet marketing and to seriously limit the amount of products or services that you might purchase.  It is very easy to get carried away and start buying up lots of different information and fall into the trap of simply consuming this knowledge without acting on it.  Internet marketing is 90 percent action and about 10 percent theory.  This is because you have to test everything out for yourself and for your specific situation and make changes as you go along.  It pays off to get moving on something and take immediate action more so than it does to get caught up in heavy research and get stuck.

If you are simply trying to market new products, then that is another issue entirely and you should start with the basic mechanics of good marketing and attempt to create a campaign that fits both your goals for the product as well as your budget.  This would involve heavy research and analysis to determine the difficulty in entering a particular market, who the target audience is, what the best medium is to reach that audience, how to best build up brand exposure, how to position your product against competitors, and so on.  A lot of this product research would have already occurred before the product was even created of course.