Here is a page of 11 low-cost applications (US sites only, but may be available elsewhere) for you to review. The reviews will give you some idea of the features available at this price tier, and clicking on the application's name should get you to an "overview" page where you can dive deeper into the product. You'll want to note that more than a few of these concentrate on hardscape, not landscape. This is another page with different options; seems to be less hardscape-focused.
Important Note!
I have not used any of these applications and, therefore, do not recommend any specific application.