Canon A590 IS

You could buy a Canon A590 IS from eBay for under $100. The one thing it won'tr give you much control over is depth of field, which is not really possible with digital cameras with small sensors (and correspondingly short focal length lenses). Only a large sensor camera such as a DSLR is capable of shallow depth of field images, but it wouldn't be possible to buy a functioning DSLR camera with your budget.