Are these pretty inexpensive?

I want to get a pool cover for my inground pool. I don’t want to worry about the kids falling into the pool, and I also don’t want to have too much debris getting into the pool either. I figure if I get one of those inground pool covers it will keep out most of the junk when I am not using the pool and then I won’t have to spend as much time cleaning out the pool. I also will have one more thing keeping the kids from falling into the pool and getting hurt, which is a definite plus.