Mind My HouseFree: All time (US$20 / year membership)

Mind My House is an online community that brings home owners and house sitters together. The deal is, you get free accommodation in exchange of house and pet sitting when the owner is away. Not completely free because to subscribe as an house sitter you will need to pay US$20 per year (the house owners can join for free).

Website: www.mindmyhouse.com

Photo credit: Mind My House