I have searched for stores that carry incense coils and they have been few and far between versus their relatives - cone and stick incense.
Most coils originate in either China or Japan.
This is unfortunate and I suggest that you let the owners or managers know you are interested in the product in the hopes they will consider stocking it. I have made several purchases from PaulaWalla and will continue to do so. They also carry smaller, one day coils. I placed an order on this site and recieved it very quickly. The interaction I had with the staff was very pleasant.