I started maintaining an on-line catalog here:
http://dvcnews.com/index.php?option=com_content&task=view&id=279&Itemid=9
You should be able to call the WDW Merchandise Mail Order line and using the info I listed on-line, they should be able to sell you any items that are available. Selections at individual resorts will vary but if the item is somewhere on property, they should be able to find it and mail to you.
We just got back from the Boardwalk and the DVC logo selection there was awful. All they had were the polo shirts and hooded sweat shirt. In years past I had seen windbreakers, caps, t-shirts, patches, luggage tags and so on.
I checked the Beach Club and they had more of the items displayed on my site. It really does vary from location-to-location.
Disney seems to be putting greater emphasis on resort-specific items rather than DVC specific. For instance, they had a wide selection of BoardWalk merchandise, most of which is already listed on my site. I'll be adding a bunch of Beach Club items in the near future.
I only started gathering info a few months ago, so we'll see how this goes.
