If the ad doesn't say "comes with 2GB card" then you have no right in any way to expect it. Why would you expect to receive something that isn't in the ad? I have a couple of cameras, a phone, and an MP3 player, all of which use SD cards of some sort, and if I sold any of them, it wouldn't even occur to me to sell the card with it, as I'll use it in the next device I buy. I can't believe I'm the only person to reply saying this...it's just silly. Unless the ad says "comes with a 2GB SD card" you weren't conned or screwed or anything else. You got exactly what you paid for. In fact, I'd say you were lucky to get any card at all. You mentioned that he broke promises to you. What promise was that? If he promised to give you a 2GB card and didn't then that'0s a whole different story, but I didn't see that in your post.
Not to mention they cost like $9US new...why worry about it?