I have an idea of buying a digital camera online. Canon A710 IS costs 0+ in Amazon, 0 in Buys.com, 0 in Circuit City etc.
Why is this huge difference in price?
Does Amazon sells used cameras?
Which online store is reliable?

I plan on buying a digital camera. But i have NO idea where to start. I looked through all the searches on here but no luck.

Ill mainly be using this camera for pictures of myself, dance recitals (which are very dark in the places we have them so a camera good in the dark would be nice), prom, senior class activities, family, etc. Nothing too major.

Preferably something 100 dollars but no more than 200.

Please guide me! I dont wanna get something and not be satisfied with it.