Hi ddoherty,
In a word … I would say no. When you are looking for a mattress that you haven’t tested in person then the options you have available after a purchase to either fine tune your mattress or return it can be one of the most important parts of the “value” of your purchase because it’s very easy to make a “mistake” and the cost of returning a complete mattress can be prohibitive.
I would follow the steps in post #1 here and if you do choose to purchase a mattress from out of your area or online I would make the options you have available after a purchase one of the most important parts of your personal value equation.
Phoenix