The internet is a low cost medium of advertisement, especially with the rise of social media. If before you needed to spend a lot of money on outdoors or radio/tv spots to get your product to the audience, these days internet gets to pretty much everyone,
Highlight Available Promotions
Make sure your audience knows about the available promotions you have on your products. Make sure they're highlighted on your social profiles, blog or websites.
Use your creativity to promote your business. Get out of your comfort zone, create your own style, your own mailing list and sms list as well: clients tend to read more the promo text messages than the promo emails that often land on the spam box.