Right now, you can get the Panasonic G1 with a kit lens for $499 at Amazon while supplies last.
It’s in the $600 or so range elsewhere. The G1 is the predecessor to the new G2 (it’s over $700 now). But even though this is last year’s model, it’s still a solid deal on a well-performing mirrorless camera.
Here’s the product link to the G1 again.