Hi, I am Tech Michael and I will be assisting you today.
Almost all digital cameras can record video and will use the SD (SanDisk card).
You can check with Walmart and Best Buy for a good inexpensive model I prefer Cannon models myself, they come in all colors and the cost will range between $100. and $400.
Personally for what do, the $100. cameras are fine, the image and audio capabilities are excellent. They more expensive ones are really just for professional photographers;-)
And yes in answer to your question about sound they all automatically record the audio;-)
If you would like more help please let me know.
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