Warning - This is gross

I know that there is nothing that I can do about this, but I've been finding kotex along with other garbage in my yard for a while. I've also found it out in front of the building. I was pretty sure that I knew who it was. There is an elderly lady who lives on the third floor. I found out for sure last night. I was sitting outside on the deck, and plop, down came a urine soaked pad - right into my tomato plant.

Anyway now that I have your attention: I finally started cleaning up my back yard with a rake - glass, leaves, weeds, used kotex, cans and condom wrappers, leaving behind a layer of unpleasant dusty dirt. I have a shaded yard so grass is out of the question. I want to cover up the dirt with some kind of cheap plastic grass yard or astro-turf. Anyone know where I can buy that? Do they carry it at Lowes or Home Depot?