Here are some exemples of alternatives to decorative concrete curbing. It is easy to see how uneven and unesthetically these products looks. It is not as sturdy as decorative concrete curbing and shifts out of place easily.
These products do not offer many colors and no designs. This means that it will be impossible to give a personnal touch to your landscaping border with them. (rubber curbing, block borders and wood borders)
For a similar price you can have all the advantages of decorative concrete curbing.
There are some cheaper alternatives like plastic borders, however they offer very bad results as can be seen in the pictures on the following pages.