Comes boxed with R4i SDHC cart only in its padded case, and is genuine from http://www.r4i.co.uk/
Couple of months old but its been sitting in my DSi since I got it and isnt getting any use, so its basically brand new.
Postage cost is £1.70 first class in padded envelope, add 90p for recorded delivery.
If you want it cheaper then 2nd class is £1.35 :)
Payment by bank transfer (preffered) or Paypal Gift.