AKIBACOM can do custom orders as well for movies not on their site. It's in their FAQ.
I mentioned this elsewhere, but many studios also sell directly from their own sites so if the titles OP wants are from studios like this, it's possible he can email them in simple English. Shipping won't be cheap, but studios with their own stores always prefer direct orders since they make A LOT more per title compared to when a person buys it from a video store or legal online site.