D.W.
Hi B.,
When I use a sitter I agree on a price before we leave- like "I'll pay you $20.00 to come over, eat dinner w/ the kids and play with them for a couple of hours" It totally depends on if they drive, how much they are going to do etc.... I live in the same area you do, and I haven't had any problems with this system. If the kids are going to be in bed most of the time I'll ask if they have a movie they want me to rent and a favorite snack.
Hope this helps.
Feel free to e-mail me!
D.