Add a Buy it now button on each page

my website printpixels.co.uk , i have a number of products and i would like each page to have a drop down menu like this website below:L
https://www.boutiquetwo.co.uk/product-price-grid/luxury-bio-business-cards

each product of mine i would like to have a number of options and a buy it now with basket and shop online so they are able to place the order and it is sent directly to me, also a payment shop system or something

i dont want to change the layout much of the site
maybe add the options part above the contact us section on the right side of each product under the pictures
ive added a screen shot
any more questions please ask