Denali camping mats from Anaconda for $49 ($140 off).
These are the second best ones of their in-house brand.
Mixed reviews, so not sure about the quality or longevity of them but usual price is $189 each.
They're often $70 or $80 off but I've never seen them this cheap. Have to be a club member to get the price but membership is free.
I'd been looking at them for a while but finally bought them when I saw that price. 2 Year warranty so hopefully if even leaky and deflating I can return them.
Just FYI anyone reading, this is definitely not light enough to take hiking with you if you want it for that. Similar mats that are hiking-focused (thinking sea2summit comfort light or ultralight) weigh about 600g. I know we won't find those at this price ever but for me this mat is categorically too heavy to hike any considerable distance with.
If you can't afford a good, light one for hiking, you can't afford one at all.
You're better with a foam/yoga mat strapped to your bag. $10 or so from target type stores. Nothing wrong with that and I hiked like that for ages.