Professional landscapers can easily negotiate rates with suppliers especially if they can promise frequent large orders in the future.  Most home improvement and garden supply stores offer discounts to professionals because it is highly likely that they will return for more supplies again.  Homeowners looking for a good deal on landscaping supplies should start by taking at good look at local department and discount stores.  Most carry a pretty good selection of landscaping and gardening supplies.  If you can’t find what you need at a store near you, check out the internet.  Many online stores have sales and clearances on all kinds of products.  When online shopping for supplies to finish an outdoor project, keep in mind that it will take a little bit of time for you to receive the items in the mail or via a carrier so you may want to shop locally if you need something fast.