Be sure you're informed about the new VRBO Traveler Fee, implemented in Feb. 2016. It ranges up to 10% and is added to your rental cost. It is paid to HomeAway/VRBO, the owner can't waive the charge unless you book directly with the owner.
A good source of information on this fee (and others) plus your alternatives for avoiding the service fee (how to find and book with the VR owner directly):
There are still fee free listing site options, a newer one for vacation rentals that is starting to get traction is HomeEscape, https://www.homeescape.com/ (free for guests and owners)... for now.