FKK-Club Darling (near Frankfurt am Main)
This might be worth checking out: [URL]http://www.fkk-club-darling.de/[/URL].
Not far from Frankfurt am Main. They now have a special offer (Sunday--Thursday 12:00--20:00) of EUR 80 for two girls (either together or in separate sessions). Entrance is normally EUR 20; not sure if this is included in the EUR 80. Even if it's not, that still seems like a good price. From the website, the facilities and women seem to be of reasonable quality. Apparently sometime there are massages on offer (though not at the time of the special offer? Again, I'm not sure if these are included in the price.
Maybe someone could check this out and report back. (I might do so, of course, but it might be a while.).