As Jim Carroll said "Every home should have one"!
And you still can - not as cheaply as when I got my remaindered copy, but still worth every penny. Bookfinder's cheapest offer (new) is £33.88 on eBay, but many more available not much dearer. A few cheaper used copies if you use 'Sam Henry's "Songs of the People"' in the search box.
PS Thanks for the heads-up about the programme, Jim. Just got myself a wifi hub here in remote Fermanagh, so may be able to watch before it disappears.