I see you are from Key West.. I love Key West.. We go down there every winter while we are in Florida.. last winter we were there quite a few times as everytime we get company they want to go see Key West..
I guess you don't get alot of fall foliage colours down there.. Up here the leaves have all changed already and lots have fallen.. We use bails of hay, lots of pumpkins , dried grasses tied in bunches as decorations this time of yr. All are readily available up here.. Only thing is the pumpkins are likely to freeze because we start to get really cold nights this time of yr and usually have snow sometime in October..
I don't have any ideas as to where you can order but there is good shopping up around north Miami and Hollywood were we stay for the winter months. Maybe take a little trip one weekend.