Hi ATX2014,
Congratulations on your new mattress … the Nature is certainly a very high quality choice
Both of these are still open. Sleepworld was purchased by another manufacturer in Houston so for the moment they don’t have a local presence but they still make regular customer service trips to Austin. Austin Mattress has just moved.
The pillow thread here may be useful.
I hope you have the chance to share your feedback once you’ve received your new mattress and have had the chance to sleep on it for a bit.
Phoenix