Hi DahliaM,
As you mentioned I do own the Natura Deluxe with the waterproof membrane which has the same diamond stitching pattern and it has held up well so far for about 3 years but if I had to do it over again I’d buy one without the membrane as I do believe it affects breathability.
Is this the one you have?
I think you’re right that they have lost a lot of business since their bankruptcy and there are many discounted prices available for them.
I had the FSF mattress pad linked (it’s made by Baronstyles) but I’ll also add the Suite Sleep and the Natura to the mattress protector list as well since both of these are good options … especially if there is a discounted price available. If you have the smartwash wool then yours has 10 oz /sq yd of wool and they also make an organic version which is a little thinner yet and has 6 oz/sq yd of wool (but isn’t washable).
Thanks for the feedback and the heads up about the Natura protectors at local stores as well 
Phoenix