I'm an ecommerce and digital marketing professional and also have many years experience in web development.

I recommend going with a WordPress based site, because there are many available themes already, and a huge community of developers that can customize them without much difficulty.

Here's a great list of Groupon clones:
https://wplift.com/groupon-clones-daily-deal-group-buying-wordpress-themes

5 good examples of Kickstarter clone themes:
http://www.wpsolver.com/kickstarter-clone-themes-for-wordpress/

Clones of wish.com seem to be a bit harder to come by. Here's a non-WordPress one called Shopr https://www.appscrip.com/wish-source-code-for-m-commerce-ios-android/ - It's based in Angular which is a fast and well supported new web framework.