The more complete this information is, the fewer questions you will answer along the way, the more realistic the bids will be, and the fewer problems you will have when you transition the business to a lower-cost hauler.
In summary, just check out the freight cost you are paying when you buy delivered. It could very well be the best possible freight cost achievable. However, it may not be.
In closing, I can help you evaluate—at no up-front cost—the freight component of delivered pricing for the products you buy. If you want to take advantage of this service, give me a jingle or send me an email.