Have you tried contacting
The Society for Medieval Archaeology? They may be able to get you a copy of the article.
Alternatively try getting an inter-library loan of the Journal. It'll depend on the inter-library loan policy of your local library.
Or you could smile nicely at one of the Students on the board. Universities with an Archaeology department will probably have the journal in stock and the photocopiers are always close by..
Hope this helps.