I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
The various types of pavers that Home Depot sells are about the most cost effective you can go, unless you have a free supply of some type of stone from a friend's property. These pavers and bed bordering products come in many shapes, sizes and colors so there is something that will be most appealing to you.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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