I'm curious. Do you always use the same sitter? How far in advance do you book your sitter? We've had a number of babysitters (found via family, recommendation

I'm curious. Do you always use the same sitter? How far in advance do you book your sitter? We've had a number of babysitters (found via family, recommendations, and job boards), and scheduling is incredibly annoying. We usually have to plan at least a week in advance, and even then there's no guarantee that our sitter is available. I'd absolutely use a service that connected me to a professional baby sitter who is available tomorrow evening, and I'd pay extra for the flexibility. (Vetting is also important. We are really happy with our current sitter, but in my experience it's really hard to know in advance)