12 Feb 14 8:26 am
For WordPress try: http://www.wordpress.org/themes/
Don't know about Blogger, sorry. :(
to be honest having an affiliate business isn't all about the theme you use, it's great to have helpful tools, but really what's going to make you your money is providing helpful useful advice to help people with their problems, so don't get too caught up on themes/templates selection; you could always buy a good one later.
Pick a design and focus on content