Hi NU 3705: Usually if an ingredient or food is associated with a vendor (in this case, Byward Fruit Market - Finger Lime), it means you can buy it there. That said, I think finger limes might be one of those things that are not always available. I made the connection between the two, as I have seen them there on a semi-regular basis. It may, however, be wise to call ahead and ask.
lady who brunches