A friend tipped me off about an online sale of merino wool clothing (including base layers) at Mountain Warehouse. It's currently offering free shipping on $50 orders, and there's a code for a 10% discount as well (SIGNUP10%).
I have no connection to this enterprise and have not used its products, but I thought some others might be interested.
There's one type of merino wool socks available as well. Two color options: light gray and charcoal gray.
Oops--forgot the link: Mountain Warehouse