The Lyrichord LP shows up on eBay maybe two or three times a year, give or take. It generally sells for about $150 - $200, which is out of my range.

That suggests to me that it is moderately rare, but there are probably more than a handful out there someplace. With enough time and money, you could eventually lay your hands on it.

It's certainly not in the "(almost) impossible to find" category like, oh, Peggy Seeger's first LP, "Folksongs of Courting and Complaint" on the original Sigma label (later re-issued on Folkways, but it's the Sigma version that's rare), or Richard Farina's 7-inch EP made with his then-wife Caroline Hester on the Scottish Waverley label.

By all reports "Skiffle in Stereo" is a pretty terrible record, of interest only because it's early Van Ronk. It's likely that most people who bought it new during the brief skiffle fad have long since dumped it.