Have you checked out Facebook's new Call to Action button available on business pages?
You can set a link to go to a variety of places:
This will be a great tool for a variety of purposes, you could send someone to your online store to purchase, use sign up to add them to your email list, or embed YouTube video if you have something great to share.
And you can change them as often as you like.
Just click on the "Create Call to Action" button by your timeline cover image.
With 20 years experience in marketing, Kath knows what works for businesses, this blog has the latest tips, tricks and innovations to help your business online.