Maybe a little change mechanism ?
I see two options:
A)
1. remove current a Stalls,
2. make the Big Sttall
3. Big Stall have same numbers "inside" stalls what now...
4. each player have same numbers slots for item what now...
B)
1. Leave it as it is, but add the Big Stall
2. The Big Stall have only list items from all Stalls
3. when player find item in Big Stall can click "Show" then focused Stall be highlights for find easy
why ? devs that hinder trade players?
pls. give mechanic Bulletin Board
we have paper
then player can to hook "ad"
and other player can "Hidden" hook message for main "ad" ... or public...
mean: http://www.uoguide.com/Bulletin_Board