I used sittercity.com and I found someone GREAT! It was kind of funny. We got talking about the fact that I went to HS right across the street from where she lived. Then I explained that my parents still live on the street I grew up on. And she mentioned that her daughter plays with a girl on that block....... She'd MET my daughter! My mom's NEIGHBOR's daughter is the one she had referred to! My mom had met her!!!! I know my mom's neighbors well enough that I made them my son's God Parents! So after hearing that my mom's neighbor had left her daughter at their home several times... Even to stay the night, I hired her on the spot!
Unfortunately, they moved to Alabama because her husband got an AWESOME promotion.
But the pay sites can certainly be worth it. Good luck!
ETA- @ SLM. :( That sucks!!! Why in the heck would someone not at least make contact to say, "I'm sorry... I found someone else already. Next time I'm in need of care, I may contact you."
It's just blatenly RUDE to not say anything at all!!!