Thought i'd chime in, as have been wondering the same.
Are you guys aware of the Varavon multi-finder? http://www.bhphotovideo.com/c/product/903410-REG/varavon_vamf_uniset_multi_finder_uni_set.html
It's specs list it as 3.5".
Varavon makes good gear, i'd rate this above the LCDVF definitely, tho I have no experience with carryspeed gear.
Cheers,
Morgan