Who should buy your product? What is your value proposition? What do you offer that others do not? You need to get the product in front of your target market. Get feedback from them and revisit your business plan.
Maybe go after the "home school" segment? Just a thought. Schools probably have similar programs already.
To increase sales, you may want to look into producing a blog and send a regular ezine or newsletter to your current list of clients (with their permission).
You may also want to network at appropriate events, provide a free white paper for customers about your product and create grassroots promotional efforts to get the word out about your new product.
You can get some publicity on a low budget, it just takes some extra time and effort.
Google Base is extremely easy to use and is free! http://base.google.com/ you can also incorporate google checkout buttons as well. Free processing for the holidays too!