Instead of paying for an evening of childcare trade with another Mom. You take the kids one night, she takes them another. It's a win-win ... you each get a night out, no one spends the going rate for a sitter, and the kids get to play with their friends twice.
This principle can be used for all sorts of deals.
An example:
A photographer and a quilter. The photographer needed a quilt, the quilter needed photos. Perfect trade and both parties walked away happy.
Think outside the box and see what swaps you can come up with. And please share your trade/swap/exchange ideas in the comments.