The Canon 40mm F/2.8 pancake lens is a great compact lens. I know a lot of people who really enjoy using it for both stills and video use. Not only is it a quality lens, but it is also normally quite inexpensive at only $200.
For a limited time, at B&H, it is even cheaper.
B&H currently has roughly 50 units of refurbished Canon 40mm f/2.8 pancake lenses available for purchase for only $149.95 – which is about $50 in savings over a brand new one. A pretty good deal on an already pretty inexpensive lens. I am thinking about grabbing one myself.
You can find this deal on B&H here.