I'm looking for something similar and the best option I've found so far is the Wahl Peanut and Wahl Cordless Peanut.

I've never used one so I can't speak to how good it is but unless I find something better in the next few days I'll probably pick one up.

https://www.amazon.com/Wahl-Professional-Cordless-Clipper-8663/dp/B00126XOI6/

https://www.amazon.com/Wahl-Professional-Clipper-Trimmer-8655-200/dp/B001FDKGIW/

https://www.amazon.com/Wahl-Professional-Classic-Clipper-8685/dp/B00011K2BA/

If you want small try the Wahl peanut, I have had mine for a few months and I love it. http://www.amazon.com/gp/aw/d/B00011K2BA?cache=57ece65cfcbc9ef700bdf840837402ec&pi=SY200_QL40&qid=1402105704&sr=8-1#ref=mp_s_a_1_1