Peka-Boo does not exist anymore, why would the quests ask for items from there? Not just unfair, plain wrong! Please stop!
I didn't encounter this to my knowledge but...that seems rather silly :/
That's ridiculous, even if it's in the user shops, why.

It could be because of their rarity. Which quest were you doing?
It was probably Quentin or Cinthia.
I don't see what the big deal is? If the quests are working corectly thwy only pull items from a specific price range. I see the items from the PekaBoo shops (the sP ones) as in the same category as the Alegarten shop items.
Does it ask for these items frequently? If not just decline and move on, not a big deal in my opinion.
Quentin. I took it when she asked for Alegarten and Lumineve items, I tried to understand the Morostide items, got really mad for making me spend trinkets in the Lounge, but what does Peka-boo got to do with Quentin? And no, I don't think it's fair, those items sky-rocket price-wise. So let alone other impossible quests (Saggi and a reborn potion!!) but skip the trinkets quest, skip the limited edition quest, skip retired items guest, skip Quentin all together? I don't want to hate her, I actually like her, but...but-but...:/
It absolutely is NOT ridiculous. It is intentional that some quest grantors ask for holiday items, and Peka Boo items are holiday items. The quest grantors ask for these items randomly.
Before grantors asked for these items, users complained bitterly that the items were worth nothing.
Peka Boo items, compared to other kinds of holiday items, were distributed very stingily and at a much higher wholesale cost so there just aren't all that many around. So even if they weren't highly priced, they're certainly going to be and this is reasonable.
Quentin has asked for retired holiday/event items for awhile now. If the price is too high, decline the quest.
I just decline those quests; it sucks to lose one, but meh!
Quentin normally asks for retired shit from events/holidays. It's nothing new or unfair, just skip the quest if they ask for one of those items.