One Stop Landscape Supply Center has a very large collection of tools and supplies for landscaping. The products range from shovels to plastic sheets, or even everything you'd need to build a pond. The staff here is extremely friendly and knowledgeable, and can tell you what supplies are best to create that pond.
The place is fairly large and has enough room to move about comfortably. It's well-organized, and the staff can help you find just about anything you need. It's located in the same place as Johnny's Nursery and makes for a perfect place to stop by for both supplies and plants. Give the center a call for more information.