Most of the checklists I have used are very short and by no means offer very little help to a flight simmer. Checklists that come with FS products are better for their intended use than those that are meant to be used on aircraft.
Still, manuals and Cheklists are all available commercially in US of a even today post 911. However some of the companies offering manuals etc, do state that their products are only sold in the US and mailed to US addresses.
Have a look at
www.eflightmanuals.com they are one with "Nothing to foreigners" policy with mosly military aircraft stuff.
www.flight-manuals-on-cd.com has mosly older aicraft, commercial and military.
While
http://www.esscoaircraft.com/ seems to have most to offer.
I got a B747-400 set from them a few years back.
JJ