St Thomas, Charlotte Amoile. On the main shopping street downtown , one of the major shops is AH Reise. Nice place , but that is a landmark for my recommendation. In between the shops there are alleyways that run street to street. Facing AH Reise main entrance there is an alley to the left,. Down that alley there is a stand where several ladies sell local prints, postcards, note paper, maps etc. I always seem to find something special there.
Sorry, don't have a similar recommendation for St Martin