Add BUY button on Facebook fan page to sell fiction novel

I need social media specialist/developer to add prominent a 'BUY' or 'BUY NOW' button on Facebook fan page to direct buyers to Amazon or Waterstones websites.

Here are the links:

www.facebook.com/closetothesoul

http://www.amazon.co.uk/gp/product/190974073X/ref=olp_product_details?ie=UTF8&me=&seller=

http://www.waterstones.com/waterstonesweb/products/f-+nizam/close+to+the+soul/9938300/

Please feel free to submit your proposals with your charges and sample screen shots.

Thanks.