I just checked the tidewater ice place. They have some interesting things to say at the bottom of their blades page. I'll say that my experience jives with theirs. Even from France, it's much, much cheaper to order MK/Wilson blades directly from dealers in the UK than from here in France; I've actually done this. I'm starting to think about my next blades, and got a long lecture this summer on why Ultima are the way to go, but honestly, I can get the MK/Wilson equivalent at a fraction of the cost.
The only things to watch out for when ordering from Europe are: taxes- usually (but not always) advertised prices include tax, and at 17+%, you just don't want to see the pre-tax price (unless you can get around paying it!). And customs, I have never had to deal with customs/duty from within the US, but here in Europe they are pretty intense about charging for it, and the filing fee can in some cases take a big bite out of the savings.
It's worth considering, I think. I have my favorite store in the UK, and am willing to share (not sure if it's allowed). But if you decide to go this route, do make sure you have a long conversation with the owner about how to deal with quality control issues such as warping- hopefully they check carefully before they ship......