To use a ‘buy now’ or ‘check price’ affiliate link

Hi everyone,
Just wanted to ask for your opinion on this. I’ve currently signed up to some of the major affiliate programs and sites (commission junction, shareasale, amazon, ebay etc.) and I’m wanting to add my affiliate links to the bottom of blog posts.
I want to attach the affiliate link to a button and I want some help deciding what text should be on that button to maximise the click-through rate.
I been thinking either:
(buy now)
or
(check price)

Has anyone done any testing with different buttons like this?
Which button do you think would be better?
Any other suggestions would be appreciated.

See original post by Neontope