On the top of my head I remember:
Keeper and Mooncup US
Also, which of the brands and/or vendors offer money-back guarantees/size change etc?
Is it ok if I use one or two of the images found in the community info? (I think the last flyer did) I will of course credit menstrualcups.org for the image, as well as generally recommending it ;)
Otherwise, I don't really intend to change the original flyer very much, except my version will be in A4 paper size.
Edit: Found original flyer, thanks!
What I have so far is found at http://folk.ntnu.no/lundanes/cupflyers
If there is anything I'm missing, or something else, let me know. There's a pdf version for easy printing (A4 paper, print double-sided and fold. Page two is the inside.) and a .doc version if anyone wants to change bits before they use it. I hope the .doc version looks right in Word, as I made it in OpenOffice.