I used to design and build these - if you have a simple yard, you can use the inexpensive mowers, as long as you don't care about having striping in your lawn.

I used to design and build these - if you have a simple yard, you can use the inexpensive mowers, as long as you don't care about having striping in your lawn. I had one for two seasons, and it was awesome - your lawn looks like it freezes in time and is healthier to boot. You just have to install an "invisible fence" style wire around the perimeter.