I tried a Quizno's flatbread last week and likes it a LOT. It was quite filling to me. I had the Chicken Carbonara, which is listed as 8.8 carbs or 5.8 if you order without dressing.

Check the counts of other selections here:

http://www.quiznos.com/index.asp

I also signed up on their website, and got a $1 off coupon emailed to me today. It is nice that it is only 1 1/2 blocks from my office.