I'm in Loudoun Co., VA. I just (Monday) ordered a 12x10 roll up door from steeldoordepot.com. It's a Janus 3652 with insulation, and delivered price was about $500 less than the best quotes I could get from the other online sites ($1700 vs $2200). The delivery part of that was about $389 (other sites were quoting $420 and up for delivery alone). Call the number on their site and talk to Sue. Great customer service.
You can get the Janus door configured for outside mounting, but you need to buy the extra hood that covers the door.
Edit: You can't compare door prices without knowing the exact manufacturer and model. I paid extra for the 3652 because it is wind-rated. It has locking tabs inside the tracks that keep the door from being blown in by high winds. Other models without that feature are much less expensive.