I have the same needs too. We can set up a group, so we have a big pool of families with little kids to exchange childcare. It will work better than one to one exchanges.
I live on south side, usually free on week day nights or weekday too. % e0 t# @% p& ?8 J$ `6 F3 _% p4 k- o
capilano mall is a little bit far though :-(