Some websites state 3mm filament but its actually 2.85mm, you just need to ask or read the fine print to find out. The one you are looking at has potential problems as it could end up being 3.05mm. which might work but not ideal.
I would stick to the correct size and use brands like the ones Didier Klein mentioned.
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DidierKlein 729
Hi and welcome to the forum,
To me good filament is almost more important than the printer itself
UM2 will work with 3mm filament, but it will have more problems (added friction in the bowden mostly).
As you said most resellers sell 3mm filaments, some of them are really 3mm with the kind of tolerance you mention, and others are more 2.85mm filaments.
There are several brands that are true 2.85mm: Ultimaker of course, Colorfabb, Faberdashery, Diamond Age (i think), etc...
I can't point you to a local store obviously
i think in the Us Printed Solid is a good web store in the us, they have colorfabb there:
http://www.printedsolid.com/shop/3mm/colorfabb-plapha-2-85mm/
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