Is it possible to customise a store with a 'buy now' button or similar?

Site URL: https://www.lessisbetter.co.uk

Hi all, 

I was wondering if it's possible to add some kind of call to action button under each store item, that takes you straight through to the checkout page? It seems like it'd be a bonus to be able to click straight through, and make buying an item more immediate.. 

Any thoughts greatly appreciated!

Many thanks, Henry