Most Sell about $4-5 Each, The Kiautchau one is or was better due to demand. Michel doesn't list them because they are not stamps but Propaganda Labels. I have some available in my Store
I can remember reading in the very old days that one "Larger Size" stamp was created for this set. I have never seen it so it is either a false statement or extremely rare. Just thought I would add this bit of an Urban Myth :-) and I have never seen a photo of it. I do know if it ever turns up.. it will be worth a bit! :-) as this set is very desirable and yet not too expensive as a lot were printed.
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https://www.hipstamp.com/listing/germany-c1920-mourning-lost-territories-label-hlucin-silesia-mnh/41153440
-10 Vignettes for the lost colonies
-9 Vignettes for the lost territories