Thanks to Iain Lee at Monkee Bootlegs who has just posted a very rare clip of The Monkees performing "Take a Giant Step" live on the 1986 20th Anniversary Reunion Tour. (The date and venue of the recording is unknown.) It didn't last long in the set that year, so this is a real treat. I've never had a copy of this in my collection, and I was quite surprised to see it in my inbox this afternoon.
Iain has it available for download here. Thanks, Iain!