Yes, I thought they were very reasonable too. I did check Carpe Diem and they do sell the markers individually for $1.69 BUT shipping is not so reasonable! After I added the cost of shipping to each marker, Amazon came out cheaper and with a quicker ship time!
After trying and trying to find an alcohol marker in my price range and one with good color choices (I did try the Bic Mark It markers but sent them back due to limited color options) I am so glad to have found the Letraset Promarkers. I have no illusions that I'm going to color so often that I'll bleed them dry so I wasn't worried about a refillable marker. I just wish I'd known about these before I bought the Memento markers!
Oh well, live and learn, right?!