D and S Car Stereo After our initial meeting with D & S Car Stereo, we determined the customer desired a low cost site that would have a high impact and attract and keep visitors coming back. The Internet was a new advertising medium for them. WSI.com Consulting showed them how the internet can help boost sales and also track who visits their site . As an avertising tool they now offer web specials to their Internet customers. This is a coupon based promotion that the visitor prints out and brings to D & S Car Stereo for a for a percent or dollar amount off of a minimum purchase.