Product Price Comparison platform!

Hi,
Looking to build a Price Comparison platform where stores add there listings and we take the best prices and price them for consumers.

For example lets say you want to buy 50 inch LED TV then you find the tv you want and we will then price the best prices on the island.

If you ahve made thiskind of website before its a big plus.

Something like this: https://themeforest.net/item/rehub-directory-multi-vendor-shop-coupon-affiliate-theme/7646339?irgwc=1&clickid=yoER5d26ExyLRoUwUx0Mo3EFUkEwnCUUP0NRyM0&iradid=275988&irpid=348948&iradtype=ONLINE_TRACKING_LINK&irmptype=mediapartner&mp_value1=&utm_campaign=af_impact_radius_348948&utm_medium=affiliate&utm_source=impact_radius

Price and deliverytime?