I got it at westcoastshaving.com The pucks are much smaller than MWF. Edit: I'm told that Shavemac (the brush manufacturer) sells it too.
Sheep milk and Lanolin, what a combo. The problem I have with soaps that contain milk is that over time, they go rancid. (In my experience, anyway, judging from the whiff I took of a goat's milk soap that was in the Travel Box).