I do not wish to turn this thread into something else, but anyhow, some information may be interesting...
Nikolas - I was rather hoping your 21 sketches might become available from some of the usual outlets, just so I don't need to pay special postage. Perhaps you could update us?
I've contacted a few (4-5) from the usual online vendors: Sheetmusicplus, jwpeppers, musicroom (this is a UK one), etc... The only to have replied as of yet is SMP, who kindly denied access to their portal for the scores of Editions Musica Ferrum. They have a rule that a publisher needs to have at least 100 titles in their catalog and we currently have 35, so there's a little more to be found... And it's not exactly easy with the rather strict quality standards that EMF has.
Now, if I may extend a bit: Sheetmusicplus offers 'flat rate budget shipping' at 4$ (around 2.5 quid I assume?), so it's not free shipping. musicroom, which is based in the UK offers free shipping for orders more than 15 quid (which again wouldn't apply for a single copy, but then of course you can buy as many scores as you wish)...
In our website, right now, we have some discounts for multiple copies of 'Sketch Music'. So if you get 2 copies you save 10% (which is around the amount of shipping) and for 3 copies you save 20% and so on... Plus shipping for 2 copies remains the same as for 1 copy (since the post office changes rates at a bigger weight than 2 scores, at least for now).
That's all the analysis I can offer right now.
We do hope to have more offers in the future, and we certainly want our scores to be found in as many music stores, online and offline as possible! That's a given for us. It's just that access is not exactly easy (and the field is vast...).
When my assistant find some time we intend to start calling around the various online vendors and put some pressure on...
That's about it.
EDIT: Nope, that's not it completely...
We actually have arranged for ALL our scores (the new ones are on their way) to be available through our N. American warehouse (in Canada). This doesn't affect people living in the UK, but for those living in the States, Canada and general American grounds, it largely affects shipping time and fees...
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I know that Ben composes differently than Bartok, but my older student (aged 15) had such a positive reaction to Ben's score, that he's studying harder now!

That makes it all worthwhile for me (though I'm not a huge fan of jazz...).