Hi libbyinarkansas,
Welcome to the Mattress Forum! 
I’m glad that you’ve found the site and that the information here has been helpful.
As you’ve mentioned that you’ve been looking at mattress “reviews”, I’d advise you to put very little stock into other’s opinions about a product, as these will be the least reliable indicator of the appropriateness of a product for you, and they usually tell nothing of the quality of the componentry inside of a product, which is one of the most important things to help your find a durable mattress (see post #13 here).
I hope that through your research you’ve been able to take some time and read through the mattress shopping tutorial here, which will walk you through the steps to make an educated mattress decision.
Just in case you need help finding some retailers in Dallas, subject to first confirming that any retailer or manufacturer on the list that you wish to visit is completely transparent (see this article ) and to making sure that any mattress you are considering meets the quality/value guidelines here … the better options or possibilities I’m aware of in and around the Dallas/Ft Worth area are listed in post #4 here .
Phoenix