The sale aid DVD's by far are the most effective way of moving merchandise off the shelves.
Just think. You walk into a department store. You're shopping for a bread maker. On the shelf, there are three different brands, which are all about the same price range and all offer approximately the same features. One box out of the three boxes is marked "Instructional DVD Enclosed." Most customers will purchase the box with the instructional DVD.
Any merchandise that retails for $30 or more should have an instructional DVD to compliment their instructional booklets.
Most people don't have time to read instructional booklets thoroughly. As a result, they misuse the product, get frustrated, and return the product for a refund.
By enclosing an instructional DVD, you reduce the returns for refunds, as well as teaching the proper usage of the product and promote your other products.
The instructional DVD also covers the safety aspects, thus insuring the customer's safe usage of the product.