Actually, I've broken one of each of these... sheesh...
My buddy has a tuner that clips onto the edge of the sound hole... The tuner part rests INSIDE the body of the uke, and only the display part peeks out of the hole... He has his on a guitar, though, so I'm not sure if that would work on a uke... I'll get back to to on that...
What about that automatic tuner you mention on the blog, choirguy? Yes, they are WAY more that $20, but... that sure looks like a good option, especially for a beginner or someone who has trouble deciding if they need to up - or - down.
Never mind... Just get the Snark and be careful with it...
Bill