The cities is about 1/3 the original set. Full set includes the shrines and Ilshenar locations which include the 3 or 4 most rare of the snow globes.
The full, Full set would/could also include the dungeons and Luna added gifted later when they gave the reindeer and sleighs. Luna, Umbra, Zento, Doom, Wrong, Covetous, Hythloth. Shame, Destard, Depise, Palace of Paroxysmus, The Citadel, Heartwood.
Low price I've seen is 200k for the commons and 1 - 2 mils for the uncommon ones.
The more rare ones, Twin Oaks Tavern, Lake of Fire and City of Montor should be 2-5 mil.
I'm going to say that Exodus' Lair, based on inflation of the last 5 or 6 years, should get a lot more than that. Without Exodus' Lair your collection is NOT complete. There's only so many to go around. I'd say starting bid 50mil for Exodus' Lair.