Here's where I got miine, and they have a return policy, I believe (I skimmed over rather quickly)
http://www.e-weddingbands.com/
I have the heavy domed 14K band (click on the left menu for 'gold bands') Then it will go to a page with all the widths they offer. I didn't look at hthe prices this time I went to the link, so don't know how it compares to what you are seeing...
Oops it seems they only have the 12mm in 14K for 500-something dollars...
http://www.e-weddingbands.com/
I have the heavy domed 14K band (click on the left menu for 'gold bands') Then it will go to a page with all the widths they offer. I didn't look at hthe prices this time I went to the link, so don't know how it compares to what you are seeing...
Oops it seems they only have the 12mm in 14K for 500-something dollars...