Hi Stacey. I think that you have already worked out that the problem lies with the camera and not the SD cards. It seems that you have two choices, first, is the camera's internal memory big enough for a photographic 'expedition', if it is then use use the camera as it is. If not then another camera would seem to be your best option. Don't forget also that a supply of batteries will be needed as they don't last long especially when doing lots of playback via the LCD screen which eats up batteries. All the best, Mike.
Humility is an endearing quality and gains many friends, whereas arrogance loses them. Mike, 2012