I think Adam was right about circle, looks like there's regular buys started on bitfinex.
I doubt that there have been very many buys on Circle.
I signed up for a circle account, and to verify my bank account will take 2-3 days.
Of course, I could buy immediately with a credit card, but I am NOT going to buy with a credit card b/c I am NOT going to take the chance of paying outrageous cash advance fees (which are likely through my CC).
Accordingly, IMHBO it will take a few days before the mass adoption of Circle will result in actual purchasing of coins.
I was able to link a debit card to my Circle account. I haven't made a purchase yet but I'm sure others have used this type of card successfully