babysitter for grad student family

Howdy. We are looking for a regular babysitter for the fall for our 1.5 yr old son. Basically taking him out at the playground, playing fire chief, pointing out squirrels, typical toddler stuff :)

We want to set up a fixed schedule for 1-2 times a week, 3 hour stints (20/hr). Prior babysitting experience required, and reliable.

We live on campus in EV.