Exped Synmat UL 7 Medium.
Best comfort to weight ratio out there. I took one of these with me for a year-long global backpacking trip last year and it was invaluable. Compresses down to the size of a liter Nalgene bottle. I've purchased a few of these for family members. The Medium tips the scales right around 1 pound at 16.2oz.
$120/shipped via Paypal gift.
I will be listing another size Small S that has seen very little use and is in relatively like-new condition.