Me & Mrs 4AM have this:
https://www.gooutdoors.co.uk/15979404/berghaus-double-self-inflating-mat-15979404/
We got it in a sale a few years ago for just over £100. It’s bulky, but damn it’s comfy. As comfy as our memory foam mattress at home. No roll together, no bumps at all. Love it.
Honestly really good . Minimal wait and always a good chat when handing stuff in and collecting. Free but donation to the charity that’s running the individual one welcomed .