I'm using care.com to find sitters. I specified that Thursday night availability is necessary, as we often have events and appointments on Thursdays. I can't tell you how many girls have replied with "I'm available every night except Thursday night." Girl! Read!
That said, some great girls have applied as well and I think we're going to get some good sitters.
Re: Babysitter vent
I finally brought it down to six top applicants and interviewed them all, having them meet the kids. I kept info for four and hired one who stood out as a real fit for us. Then I cancelled my care.com account.