Hi! 
I want to use/create an autocomplete textbox using Lightning Web Components. Particularly, I want an autocomplete textbox for looking up a PriceBookEntry2 so that I can add a product to an opportunity, on the same page as Opportunity. 
I see options for autocomplete textbox for Visual Force, for Aura Lightning. However, I can't find anything for Lightning Web Components. 

I do see Lightning-Input (https://developer.salesforce.com/docs/component-library/bundle/lightning-input/example), but I don't know how to make it an autocomplete type.

What's the best way to go about it?

The final result needs to be an opportunity form, where a person can add/edit/delete products on the same page.