Semiquincentennial Quarters

Dang, that's a word...... I got excited when the state quarter series came along and I stashed rolls of my favorite state quarters and that ended up being an exercise in futility..... Well, I find that I am a bit excited about the semiquincentennial quarters. I think there are some really appealing designs there. So here's my question. I can buy them from the US mint at a little better than 2X face value. Is there any valid reason that I can't expect to purchase them from my bank at face value?