A word of caution. I am not implying anything, but its only for a safer environment for everyone on the bitcointalk forum. The seller intends to collect the payment right after shipping happens, but that opens up an opportunity of scam(again not implying he is scamming).

Fitbit won't be giving you an account to sign in, so there is no way to know if the tracking code provided is from fitbit or a dummy tracking number. I have requested the seller to have an escrow for all the way through, as that doesn't change anything and only brings him more sales, but he has refused to do so, and hence raises doubts.

Please ensure steps for a safer transaction for both the parties and don't jump on the offer only because its  good to refuse.