You want 400 codes because I can get that ... (lol)
Not surprising really, Merlin tickets are 100x more valuable because you actually have to pay for them, unlike Wuntu codes where you can just get them for free...
I literally offered double the rrp of the tickets in codes ... still nobody would trade :/
Worth a try (lol)
How did you manage to claim another code as it only allows one? :/