My eight-year-old son mistreated an iPad and broke a screen protector. It was an accident but very easily preventable. Had the impact been much worse, it would have been ruined.
The way I was raised - and still much believe - is that the relatively small cash value (a bit under $10) is much less important than the mistreatment. This is especially true when it isn't his iPad.
Should the cost of replacing said protector come from allowance for general chores or have its own dedicated (and preferably unliked) payment, such as cleaning the bathroom a few times? Should it be handled another way entirely?