I'm always checking for sales on Patagonia Capilene. Lucked into Rock Creek's last pair of Medium Cap2 bottoms in a discontinued color(blue) last week for $28.95, but am still on the lookout for more for work.
Outdoorplay.com has Cap4 hoodies in Large and up for $83.32. Not familiar with the site, but a selection of men and women's(edit: @30% off)
Campmor has Cap3 zip necks in Large for $34.96, which was too hard to resist.
As usual the available sizes vary, but at least these sites have had something besides S and XL or bigger.
Anybody else? I wouldn't mind some more Cap3 bottoms...