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synchonized flash light for cheap?

Also posted in "burning question " forum

Hi,

I am looking for someone who could do an synchonized flash light such as this one but for much cheaper ;-)
The challenge is on synchronizing the camera with the flashlight, if possible wireless.
The light itself and the diffuseur are no real topic.

The use of such devices helps a lot when taking pics for your I'bles or your ETSY shop if you have one.

Thx

B