It's 'caving related' equipment I reckon, because we car camp so much.
Cascade Outfitters has its sleeping mats on sale.
I got a 'Big Mat' for $58.00, which is $38.00 off, and it is quite nice. I'd say it's as thick as 3 standard backpacker style Thermarests.
http://tinyurl.com/7k5ju
They also have their version of a paco pad on sale. Check it out...
http://tinyurl.com/bq6l9