Many of the nowadays more desirable TM LPs were sold from Woolworth bargain bins for 14/6d around 1968/9 when the mono issues were deleted. At the Woolies in Oxford St where I worked Saturdays as a kid had multiple copies of all the lesser known artists eg Brenda Holloway, Fantastic Four, Spinners, Monitors etc. I bought most of these out of my £2 wage. There were multiple copies of the MLK album as well but nobody wanted that as it was spoken word - so they were probably almost all trashed.
Paul TP - you're right there were 3 Motown Memories albums.
I still have them all except the BH which I sold, but luckily soon replaced with the even rarer stereo copy.