Seeking Childcare Wednesdays 3:30-6:30pm for 16m.o. boy

I am seeing care for my son on Wednesdays from 3:30-6:30pm while I work.

He is almost 17 months old, pretty easygoing (in the words of his other caregivers), happy, etc.

I am seeking:
1- a mama with a young child who wants to watch him for trade or reasonable pay
2- a nanny or babysitter share 
3-a babysitter (high school? college student?) at our home for reasonable pay

Preferrably you'd be in SE; we are in outer SE near 205, and I work close-in Division, so anywhere between the 2 would be fine.

You wouldn't believe HOW LONG I've been seeking a sitter, or how DIFFICULT it has been. I am so willing to do a trade or pay the right person...we cannot afford $15/hr but $10 would be reasonable.

Thanks so much,
Christine
christine@ecosky.com