If the cost of everything else is rising, Why are digital camera's the only product to buck the trend....?

Question

..... It said on the news they were 20% cheaper than last year.

Answer 1

They are hardly the only product bucking the trend, but any individual product has it's own micro-economic situation.

Digital cameras are probably increasing in supply, and higher production quantities is pushing down costs.

Answer 2

They're relatively new technology and manufacturers are figuring out how to produce them cheaper.  As more and more people buy digital cameras, the manufacturers also benefit from economies of scale:  that is, when you make ten million cameras, the cost PER UNIT tends to be much lower than if you were only making, say, ten thousand.