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https://warframe.fandom.com/wiki/Star_Days
I think they came back for something else too (a nightwave after a quick look), but in general they are event exclusive.
They are likely to return next Valentine's day, but there is no official word yet. As of now, there is no way to acquire them.
also nightmare missions dont have a special spy mission drop, and nightmare only gives special mods
Look at the link I provided to you. It shows the price below Eros Wings Ephemera and additional information such as when the event started in -21 and -22.