I have delayed too long several times on Nikon refurb sales, but just kept frequent checks and have always managed to purchase what I was after, just with a delay of a few weeks, sometimes at an even better price.
Thanks for sharing your experience. I hope we may see the Zf at 1200 again. I like the body only option because I would like to add the 28mm/2.8 SE, which does not come as kit. However, I would still need to get my hands on a Zf body and play with it a bit before I would want to buy it refurbished.
When I post about these refurb sales, I usually mention that "while supply lasts." When I was a teenager, I missed a few buying opportunities because I waited an hour or two and the stores were sold out. Nowadays when I go to a brick-and-mortar store, if the supply for an item is low, I place it on my (physical) shopping cart immediately and continue shopping. I can always decide not to buy it later on.
And if there are some sale items I am interested, I always order first before I post about the sale on this forum. :-D
Concerning the Zf, definitely hold one in your hands before you buy. In particular, if you are going to use a heavier or longer lens on it, the lack of a true grip can be an issue for some, and I don't like any add-on grips.