For most of these places, if you dont' have contacts, then I suggest you pay attention to the $$ rates and also your surrounding. SZ is well-known for ridiculous prices (Mainland Overall Standards). But you never know what you might just get. All in all, its worth the try just so long as you don't get into trouble. $$ can earn back, but all else..abit hard
Good luck and hope to read your F.R soon
)