fractional size AAA cells and battery packs

Has anyone found a good source of fractional (1/3 or 2/3) sized AAA cells or 4.8V packs? I have been getting them from onlybatterypacks.com, but am looking for another source.

Try your local Batteries+

I did a google search on 1/3 AAA and founds several hits, eg

http://www.megabatteries.com/item_details.asp?id=13864&cat_id=22

I also found fractional AA, eg

http://www.batteryspace.com/Customize-Nimh-Battery-4.8V-300mAh-1/3AA-NiMH-Battery-with-26-AWG-wire.aspx

Another possibility is to use 1s lipo. Although nominal voltage is 3.7, they start at 4.4 charged, and hold a good voltage for a long time.

John

Thank you for the suggestions. I am particularly intrigued by the suggestion of using a single cell LiPO.