Whats a good Wordpress theme...
 

For a mainstream affiliate merchandise sales site?

Any "portfolio theme" + custom theme hacks.

what exactly are you selling, like a shop? or something else.

Why not make your own theme?

I just do a Google search for free themes. There are some real good ones out there that look professional I use all the time.

By asking the question, I am assuming your not too particular about the theme... so rest assured there are heaps of free themes available that don't look cheap.

GewGol is really your friend on this occasion.

atahualpa is hands down the best theme evah