Mike did you see this:
I am now using the Plotsaver tape discussed in this thread and so far it looks good. (EDIT: well it did look good until about an hour after posting this…)
I don’t think either motion activated sprinklers or ultrasonic repellers are good long term solutions if you have very high deer pressure like I do. I spent a lot of money on motion-activated sprinklers and they only work for half of the summer. Look at the reviews of the ultrasonic devices on Amazon, you will see more unhappy reviews even compared to the sprinkler reviews.