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Any proper industrial supply will be able to get them and probably have the small end mills in stock. We use stuff that small all the time. Hobbyist stores will not be likely able to help you
When you start asking for mills that are so specific such as 0.1093 you're looking to have a batch of them custom made by a maker. Instead I suspect you're going to need to use a 3/32 (.0925) and make two passes to size the slot.
Looking at Enco tools online the smallest miniature end mill size they have even in "miniature" sizes is 1/32 or .032. So again it would appear that you're looking at a highly specialized product unless your .025 is a typo.
The metric taps you want are all listed and no problem. If you don't use Enco then KBC in Canada will also have those sizes.
You can find the end mills you're after here: http://ww w.mcmaster.com/#end-mills/=o1r690 Scroll down to carbide mills and select miniature carbide end mills.
And the smallest taps offered by the same company are here: http://ww w.mcmaster.com/#standard-taps/=o1r7wk You're looking for the link for micro thread hand taps.