What inexpensive app can I use for promoting products on my site?

[KellyTour]

Hello, can anyone recommend an inexpensive app that will allow me to add a fly-out window or sidebar widget that recommends a popular or bestselling product?  I do not want an upsell app, just another way to have a potential customer view/click to another page.   I would like the pop up to look like image below, but say "hey, this is one of our bestselling products!"  And definitely be low-profile, not in the middles of the screen.  Same size as this image or about and on left or right side of the screen.  Main goal here is to keep potential buyers perusing my shop.  And then of course making a purchase.  Thanks, Kelly T 

[Ryo14]

Hi @KellyTour,

You can try app Popup. I see it also has popup that you want