Any Michaels/HL/AC Moore type store will have them if you want them loose to make your own arrangement. I go to AC Moore up here and they always have 50% off sales on silk flowers.
Side note: how do you hang the wreath? My H doesn't want to put a nail in the door. What are the alternatives?
We didn't want to use a wreath hanger because they can mess up the seal and we replaced our door due in part to the fact that wind and heat essentially blew inside as if it wasn't there.
Our door has a window in it, so we have a giant suction cup thingie:
Side note: how do you hang the wreath? My H doesn't want to put a nail in the door. What are the alternatives?
Would he oppose a small tack on the top of the door?
You can tack ribbon to the top side of your door and hang a wreath from it. Depending on how tightly your door fits into the frame, the tack does less damage than a proper hanger which will scrape against the frame.