Right now there's a 7.7% sale on the well-respected Mount Washington 3 (20F) underquilt ($239.95 instead of the regular $259.95). Some other quilts are on sale, too, but I was looking hardest at the MW3.
And there's an additional 10% off if you get it as part of a quilt set (TQ + UQ).

I got my Shenandoah (40F) and MW3 (20F) last week as a set. I haven't had a chance to try the MW3 (too hot outside!), but the Shenandoah is nice!