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There are lots of devices you can put out, including water sprayers and noisemakers. I have also heard of "Scat Mats" or "Scat Cats" you can put down - they are soft plastic spikes that cats don't like to step on. This sounds a little mean to me, though... You might also try some kind of repellent spray, either predator urine (I know...gross) or lavender, which cats supposedly don't like the smell of.
I have put chicken wire down in garden beds. Cats don't like walking on the wire and can't dig either so usually go somewhere else to do their business.