Films that have not yet been mentioned in this thread:
Adox CHS100 II is offered in 6.5x9cm as well as in 2.25x3.25 inch, but is currently out of stock
according to their price list, Wephota NP15 (ISO25), NP22 (ISO100,) and NP27 (ISO400) are available in 2.5x3.5 (not 2.25x3.25 it seems) and 6.5x9cm, as well as some more technical film (Ortho 25 and ORWO/filmotec negative duplicating film)
One of the film holders I acquired had a sheet in it. The holders are marked 2.25 x 3.25, but the sheet of film measured out to 2.5 x 3.5. So I now have 3 selections to choose from; FP4, HP5+, Arista EDU 100 & 400.