The first season of Lost Girl is about $21. About the same as the DVD for most shows, but you can watch them now.
Being Human is a British show, so the cost is going to be more, and the price is currently 19 pounds, so it'll be around $30 per season. That's still in line with most other DVDs from that side of the pond (Sherlock, etc.)
But it's not a rental, you get to keep them.
Don't believe everything on the Interwebz! A duck's quack DOES echo!