Communicating from one view model to another view model

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p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Calibri; -webkit-text-stroke: #000000} span.s1 {font-kerning: none}

I have widget A and widget B on the same page.

 

Widget A has the title of the item and that widget B has the price.

 

I want to grab the price from widget B and include it in widget A. 

 

What is the best way to do this? Do you have any examples? 

 

Thanks