Whilst Vanbar is an extremely big supplier of most photographic consumables, there are some things they will not stock, seemingly sometimes without reason, other times with reason.
They have some limited supplies of certain B&W film brands, which I believe is because they are the importer of other brands of B&W film, I could be wrong, but it looks that way.
When Spotone left the scene, there was for a time, a dearth of this kind of product around. One day I was chatting to a saleswoman I knew well, when I mentioned that there was a replacement for this product.
This was news to her, so with a minute or two searching the web, we found the replacement product, her reaction was very positive. On a later visit to the store I enquired how she had gotten on regarding the Spotone replacement. She looked glum and mentioned something along the lines of, "the supplier of that product to this country has a like line of B&W film products in their imported range, so no go!"
Basically it can be politics, price, or just too hard.
Mick.