Difference between CR123A batteries and [brand] 123?

Factual Questions
1

My sister told me to go and get CR123A camera batteries. I go online and find [brand name] 123 Lithium batteries. Are these the right things? Or is there a difference?

Why do they do things like this to me?

(I went to a camera store, and they wanted $30 for two. Online, the ones I’m finding – the ones I’m asking here about – are ten for $12.00 What the heck is going on?)

2

Yes they’re the same.

Why does Best Buy charge $70 for an HDMI cable? Because someone will buy them.

3

Thank’ee! My sister thanks you, and her camera thanks you, and my wallet thanks you very much indeed!

(Have I ever mentioned how incredibly awesome the collective knowledge of the SDMB is? This place is better than Wikipedia!) ( :wink: )