It would only set you back $25 online dollars (? really) and is available from photojojo.com...
It's time to take your iPad photography one step, or 10 steps, further with the iPad telephoto lens. This lens adds 10-12 times telephoto power to your iPad. It gets you closer to your subject without having to depend on your iPad's digital zoom (a real pixel killer).
So hoist your iPad high, and snap away proudly. Your iPad may look a bit silly in this get-up, but you are going to end up with some seriously super photos!
Apparently, the iPad telephoto lens has a manual focusing ring, "to give you added control over its delightfully shallow depth of field" and other options are provided, including a "dreamy lo-fi look".
Hmmm. What's your verdict?