This is PageFly - Landing page builder.
You can give it a try with WideBundle - Quantity Breaks app to create the same bundle section like this.
You can check their demo store
Moreover, PageFly also integrates with WideBundle so you can build a nice product page with both 2 apps.
Hope this helps!
If you find it helpful, please let me know by giving it a like or marking it as a solution.
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