Hi hubbs,
I think the most important answer would be the integrity, knowledge, and tranparency of the retailer or manufacturer. I would not suggest doing business with FBM if getting what you think you have ordered is important to you. I would read post #2 here and post #2 here among many other posts on the forum before considering them.
There are legitimate price differences between different manufacturers and retailers that are more apples to apples comparisons and is the reason people compare different options and sources and there are also price differences that are based on supplying different materials than what is advertised or based on other “less legitimate” comparisons.
Phoenix