So how does one order a Print-On-Demand?

By Dejio, in The Lord of the Rings - Print on Demand

So how does one order a Print-On-Demand Stand-Alone-Scenarios that's Out-of-Stock?
In particular, I'm interested on "Fog on the Barrow-downs" and "The Battle of Lake-town".

They're not truly print on demand, instead you can only buy them when they're reprinted and in stock. Lucky for you those two seem to now be in stock so better grab them up!!