You will still have to pay the shipping, and it is something like $12-15. It isn't a completely crap sling, IMO, I liked it to take to church because 1 - it fit in the diaper bag and 2 - I could do it one handed by myself but it definitely wasn't the best thing I tried, and I wouldn't use it for an extended period of time. I have actually used it a few times to take DD into the shower now, like on a couple hot days during the summer when we were just trying to cool off.
Re: free seven slings
I saw this deal before and asked around about it, but people said they're crappy quality.