I know there have been many threads around the
complex of "cel books" but nearly all of them
ended with the recommendation of the Itoya books I
think everyone here knows. 

My question is: "Are there any alternatives"?
What I'm searching in particular is a "cel book"
with hard cover that can hold standard sized cels.
I made the experience that the standard sized cels
without background tend to get optical "lost" in
the relatively big pages of the Itoya books
(smallest size with 11x14") and therefore I'm
looking for a "cel book"/art portfolio which is
just big enough to hold the standard sized cels
(without background) well (with hard cover would
also be fine, because it's more stable and looks
better; has everyone of you such books?)

If anyone here has such "cel books" as described
above I would appreciate it if you could tell me
where you get them!