Seeking Berkeley after-school care in May & June

My husband got a new full-time job (hooray!), which means that we have a sudden need for afterschool care for our kids. Anyone know of an under-the-radar afterschool program that might have space available for two days a week, from May until the end of the school year? My kids are in grades K & 5 at Cragmont in Berkeley (where the LEARNS program for kindergarteners is full). Or, if you know of a good place to post a listing for a part-time babysitter (like at Cal or other nearby colleges), we might end up going that route. Thanks!