Because they only started adding event furniture to the Mogstation last summer, and only the furniture of the event we are currently at.
We haven't come around to Little Ladies' Day yet, that's all.
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The Eastern Cherry Tree is on the mogstation now.
$5.00 per tree or $10 for two trees and a felt mat (that red one with the umbrella).
Was about to make a post about this, but you beat me to it dusty XD
I still think the furniture pricing is pretty ridiculous, but at least they are getting better by releasing furniture set. It's pretty much buy 2-get-1-free in this case.
Personally I think returning furniture should cost 3 USD each, cash-shop exclusive furniture (like the tera-flare bahamut miniature and the carbuncle lamps) should cost 5 USD each and any consumable/interior design furniture should be 1~2 USD each. Or even better, change it to a buy once to unlocked it at a special NPC to be purchase with gil method instead.
Well... that's just my opinion :/
I don't think I had started playing the game again since leaving during 1.0 when the event to get the trees had been done. I've looked every time the little ladies day event comes around hoping to get a tree or 2 an the cute mat with the umbrella and have always been disappointed when they're not purchasable from the npc.
Saw the thread before 3.55 update
So... Gratz you finally get your trees:D