Re: What widget is this?
I'm pretty sure there is a custom script behind it, I don't know of any merchant widgets that would do this.
It looks like they are pulling in all the prices from the merchants product feeds, and then aggregating the data themselves.
Technically it's not that difficult to do, but there is still a bit of manual labour involed as well, as a lot of merchants feeds are pretty poor and you have to correct the data by hand normally.
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