LED Power supply?

I have approx 200 flashing LED circut boards that I want to make a twinkling display from. Each board has a single LED that flashes about every second, each board also has a single 3v cr2032 lithium battery powering it. What Id like to do is remove the battery on each one and wire them to a DC power supply that can be plugged into 120VAC. So I actually have two questions:

Should I wire these in series? Or parallel?

What size power supply would I need?

Heres a link to a picture of what I have.

Thanks (in advance) for all your help!

Picture of LED Power supply?
Parallel/series. Put 4 in series with a 12V supply, then another 4, then another 4 etc.