Just an idea, but it is pricey....

1. remove torso

2. create mount and plop this baby on top of the chassis

Panasonic BL-C131A Network Camera Wireless 802.11

http://www.amazon.com/Panasonic-BL-C131A-Network-Camera-Wireless/dp/B000NVR9SM

3. You'll need to add a power source...maybe a 9v wetcell also. You won't be able to recharge it remotely as is, but with some handywork you can make a charge base you can back the robot into to charge the wetcell.