If you have access to mfg. you can very well make your own inner sleeves. Show him/her the material (I think it is HD Plastic). Audiophiles prefer acid free paper or high quality plastic material, but when I see old mint quality vinyls which have survived probably 50/60 years in cheap paper sleeves I don't bother. I love some UK pressed vinyl inner sleeves in my collection which have thin but stiff paper sleeve laminated inside with plastic. They slip in and out of the album jacket nicely. See if you can manufacture that.Where do we get these sleeves? What material are they made of exactly? I have a relative who manufactures flexible packaging material, i can ask him to manufacture a few hundred/thousand for me and members if they are intrested.