http://www.drilltechnology.com/
I actually e-mailed them for a quote, because going over "Warehouse#20" was getting a bit tedious! You won't find the price I quoted you either
unless you e-mail them.
Look for extended length, 2 flute, square ended, endmills. My part# is EM2XL-0400. The diameter is actually 0.0400 inch, but that's as close as I could get it to 1.0 mm, which is 0.0394. Since it's an american measurement, it's cheaper, for me.
When I told the guy what I needed it for (milling channels in copper) and asked for TIN coating, he said that these were "Sub Micro Grain Carbide", and that TIN coating wouldn't be necessary: it should be strong enough. He can add the coating, for $2.00 extra per bit (he can also add TIAlN for an extra $3).
Since you're in Malta, I'd be willing to help you out, if you want to order directly, through an intermediary, or you can wait until I place my order, to add yours to mine.
[edit]
Here's a direct link. Note the flute depth, at 1/4" (6.35mm)!!!