Watch out! The first one is 99% a scam. That seller (yaslulin) has several titan and sp31 listings, all insisting payment in btc. I checked his feedbacks and it's very suspicious. He got feedbacks from sellers who sell used paper clips for 1 cent and such. Typical method for building fake reputation.

I see huge number of bids on his listings, it seems someone gets scammed soon if not already
Btw his prices are too good to be true...