they don't.
you cannot buy it - you can only get it via side goal completion.
this is where i'm lost.
maybe anyone noted when had the artist's stall been removed from the market?!
here's where it was when i took screens in october/november 2017
(located in goal prizes section, available for purchase if you unlocked it via old 2015 goal):
and here's where it's now, in abt half a year
(located in normal order between other level 12 stuff, unavailable for purchase, i.e. actually removed from the market):
i cd miss smth...
did we get any events / sales during last half of year where it's been notified that this item will be removed from the market?
or we sd expect now that anything can be removed w/o notification?