our friends bought us some kirlkland beds from Costco a couple years ago for watching their dog while on vacation, and it is nice. Has a double lining that can be unzipped and washed, water proof, if that matters. We don't need the water proofing so much, but it seems to keep the dirt and hair from working into the high density foam like other ones we've had.
I'm sure they rotate thru at Costco pretty quickly, so not sure exactly how they differ from the new ones, but these are about 4 years old, and about as good as they day they gave them to us with daily use from a couple 60lb dogs and a few cats

All I know is there are a Kirkland brand and are about a third the cost of others we've tried with a lot less luck.