My recomendation is an older model Casio
I paid around $250 USD for this camera about a year ago, now you may be able to find it for well under $200 USD.
Casio Exilim ZOOM EX-Z120
7.2 Megapixels
(2) AA Size Batteries (accepts and has camera settings to maximize battery efficiency for alkaline, nickel metalhydride, and lithium ion battery types)
There is an audio recording mode. Capacity is limited to remaining space on SD card. With my 2 GB SD card, I can record over 100 hours of audio
Optical Zoom 3 X
Digital Zoom 4 X
Image Format JPEG
Automatic - Manual settings, best scene modes
Exposure Settings Program, Automatic, Aperture-priority, Shutter-priority
1/1.8" CCD
ISO Equivalencies 100, 400, 200, auto (50-400), 50
10 sec, 2 sec Self Timer Delay
LCD Screen Size 2 in
Optical Viewfinder with Real-image zoom
White Balance Custom, Automatic, Presets
Secure Digital (SD) Card Removable Memory
Weight 0.2 lbs
Dimension 2.4 in x 3.5 in x 1.1 in (HxWxD)
POCKET SIZE
I'd recommend using the Energizer E2 Lithium AA size batteries with this camera as they last a very long time. I completely filled 2 GB of memory before I had to change the batteries
For an extended trip with this camera, I'd recommend getting as many of the highest capacity SD cards you can afford.
I have a 8 SD cards of varying capacities (1 x 16 MB [came with the camera], 3 x 256 MB, 2 x 512 MB, 1 x 1 GB, and 1 x 2 GB) and seldom use more than the GB cards unles I'm on an "extended trip"