Price Inquiry: Hibana T-shirt (Size L)

Hello fellow Adomins. ​I recently stayed in Japan for a few months and also acquired a second Hibana T-shirt at the Ado's online shop. (I already bought one in Amsterdam at the concert). My problem is that I acquired the wrong size L (I usually wear European M), thinking the Japanese size would fit me. ​I plan to determine a fair value for this item, which is an original, not a fake. ​So, my question is: What would be a reasonable market value for a Hibana T-shirt in size L? The currency doesn't matter as I can't convert it myself. ​AGAIN. I AM NOT SELLING HERE. I AM JUST ASKING FOR A PRICE ESTIMATE. DEAR MODERATORS, PLEASE DO NOT UNJUSTLY REMOVE MY POST. ​Thanks in advance and a merry Christmas to all who celebrate.