These guys don't deliver. Tried to order once from these chaps when I found them on the store locator, but found that my order was placed outside delivery hours so it was a no-go. Tried again at another time, only to find out they actually no longer offer delivery from this location at all, even though the Port of Subs website lists them as doing so.
I eventually managed to contact another location on Badura south of the 215 Beltway that delivers to my area (off of Rainbow & Russell, ironically four or so blocks from this location) that was friendly and professional. If you want a sandwich delivered with a minimum of fuss, contact them instead. Don't bother with the Rainbow location.