Does CF sell their 81/2 x 11 3/4 (A5?)paper as loose sheets in bulk? Like in a ream?

Looking at my packet of Clairefontaine DCP paper, it lists A4, A3 and some other sizes which are probably US paper size equivalents.
The same applies to my packets of HP Colour Laser and OCE TopColour papers.

However, you should be able to buy a pack of A4 and get some, or all, of it cut down to A5 at good print shop. If you get a third of an A4 ream cut down, you will end up with 2/3 ream of A5 and 2/3 ream of A4.

The only cut sheet paper I have seen that is available in A5 is Australian Reflex paper, but that is too rough to write on with a fountain pen.

I guess I meant their A4 size - 210 x 297. And I was talking about a Clairefontaine more like their Triomphe. The DCP is a laserjet, isn't it. I already have a ream of HP Premium Choice 32lb.!!

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I don't know, but I would say to contact Sam at www.pendemonium.com. She will know everything about Clairfontaine.

On www.papiers-clairefontaine.com, a photo of a pack of DCP shows "Digital Color Printing" in English on the label, which surprises me a little bit.

Clairfontaine's other two A4 size office papers are Clairmail, which is light (60 gsm), and Clairalfa, a text paper for laser or inkjet.

Could anyone report experience with writing on Clairmail with fountain pens?

That imperial dimension would be A4 paper - not A5.

And yes they do. It is available at Nota Bene, for example:

http://www.nota-bene.ca/

Thanks...this is in Canada, isn't it? Do you know what "Lined Margin" means?

Yes, Nota Bene is in Montreal, and if you contact them, Russell the owner is very helpful and accomodating. I recommend them highly!

I would assume that "lined margin" means that the paper is lined, with a margin (the image on the website shows blue lines with a red margin down the left side, like your standard lined loose leaf paper.) I have the squared loose leaf paper, and it does not have a margin on the side.