I looked for this fairly recently. I could not find it in sheets in the UK - only in rolls from one mini-lab supplier at around 120-200 quid per roll depending on width and length. Never did buy any... Search for "Endura Metallic" at: http://www.photomart.co.uk/ProductList.asp if you can put up with rolls.
The last box of Endura I bought was made at Harrow, but had been warehoused in France before returning to a shop in England, where I bought it. I live about 5 miles from Harrow...
I was lucky enough to get a couple of 8x10 sheets through APUG, and gave it a try.
It's a particular paper. When you look at the picture, it really look as if it's printed on metal, or made of metal. The colours &c are the same, but they have a sort of metallic sheen to them. I have to admit, I find it a little bit cheesy, but I can see how it would work well with some high-impact fashion/advertising pictures.
hey Matt, I love this paper and yes, very hard to find in sheet form anymore.
I was lucky enough to find it when it came out years ago in lots of sheet sizes and bought quite a bit to last me for awhile, and 1 large roll to cut down when the sheet stuff runs out.
I like the paper because it kinda gives me the Ilfochrome look without the hassles of trying to get Ilfochrome materials and having to deal with the contrast masking issues.
So, if you can find some I recommend getting it.