Hi mdh2449,
I’m glad to see you found the Austin list … and I wouldn’t worry about Labor Day 'sales" because the better manufacturers and retailers have good quality and value available every day of the year (see post #5 here).
A mattress purchase is one of the most important purchases you will make in the next decade or so and will have a bigger effect on your overall wellbeing in that time than almost anything else you buy so I would take your time and you certainly don’t need to feel any time pressure in your search.
I’m looking forward to your feedback and of course any questions you may have along the way 
Phoenix