https://www.ebay.com/itm/334789190460?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Ztyn5pAwRXC&sssrc=2349624&ssuid=LgDTwvkRQK-&var=&widget_ver=artemis&media=C

https://www.ebay.com/itm/334789190460?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Ztyn5pAwRXC&sssrc=2349624&ssuid=LgDTwvkRQK-&var=&widget_ver=artemis&media=COPY https://www.ebay.com/itm/334789190460?mkcid=16&mkevt=1&mkrid... If you want an original. Easily available at office stores you have: accordion file holders, box file holder, Options such as: https://www.google.com/aclk?sa=l&ai=DChcSEwi4iaiE-qn_AhXO5cgKHeIzAuUYABA3GgJxdQ&sig=AOD64_3ILZx3TkS1YxiPcIa-Mt1thB29Eg&ctype=5&q=&ved=0ahUKEwiypKCE-qn_AhU-EVkFHVGNAnoQww8Ixw4&adurl= https://www.google.com/aclk?sa=l&ai=DChcSEwi4iaiE-qn_AhXO5cg... And https://www.amazon.com/Ultimate-Office-30-Pocket-PocketFiles-Spring-Loaded/dp/B0BSHMSHW4/ref=asc_df_B0BSHMSHW4/?tag=hyprod-20&linkCode=df0&hvadid=647322432161&hvpos=&hvnetw=g&hvrand=3171689332305326272&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1025197&hvtargid=pla-1969912615591&psc=1&gclid=EAIaIQobChMIuImohPqp_wIVzuXICh3iMwLlEAQYHSABEgJP6fD_BwE https://www.amazon.com/Ultimate-Office-30-Pocket-PocketFiles... A 4x6 offering: https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwizjZDV-qn_AhVPQnIKHQsyDnQYABAgGgJxdQ&ohost=www.google.com&cid=CAASJORo-9z1WtykexGBukvVB9cVvEST6747Ks21FJKviHCBWPgf7g&sig=AOD64_17Y7pIddcc-6KQvBnGY7XfMBmUrw&ctype=5&q=&ved=2ahUKEwj47ofV-qn_AhUlElkFHYL1Cd8Qwg8oAHoECAMQOQ&adurl= https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEw... But if you search for “card catalog” or “library card holder” You’ll find some new 4x6 options. https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwjB6ZXv-qn_AhWR2MgKHYlAAZ4YABAYGgJxdQ&ae=2&ohost=www.google.com&cid=CAASJORo421ojPYBNFAWrV-XIZdEPAGKjYmNTA6Q8P_cXWv16QP29Q&sig=AOD64_1wn6W1cbQfv2EIhRPiOWEB8c-ZPQ&ctype=5&q=&ved=2ahUKEwj6qI3v-qn_AhX1EFkFHW0AC3AQwg8oAHoECAQQKg&adurl= https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEw... https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwix4taN-6n_AhUPVHIKHS6OAJoYABAIGgJxdQ&ae=2&ohost=www.google.com&cid=CAASJORoRCYBsLG-BKKkA0qejepBz0Y5nsuprXWyRseDBncmLrp9PQ&sig=AOD64_1BaqQU2PpTzT_EiOJmjeXnUhtsrg&ctype=5&q=&ved=2ahUKEwi2_M6N-6n_AhWbD1kFHeUmDesQwg8oAHoECAQQDA&adurl= https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEw... Something like this might also work: https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwik3MfK-6n_AhWP4MgKHXMZCx4YABAPGgJxdQ&ae=2&ohost=www.google.com&cid=CAASJORoORmc6Lx2P_fsJtlT62tStHVd5wY0yzZQ_c5eueMg6zeeZA&sig=AOD64_0G0m88mjdew_s8t5TFDyqTcdPRBQ&ctype=5&q=&ved=2ahUKEwjjzr_K-6n_AhW8D1kFHWrVAZQQwg8oAHoECAQQDA&adurl= https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEw... Personally, This https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwik3MfK-6n_AhWP4MgKHXMZCx4YABAnGgJxdQ&ae=2&ohost=www.google.com&cid=CAASJORoORmc6Lx2P_fsJtlT62tStHVd5wY0yzZQ_c5eueMg6zeeZA&sig=AOD64_2UoRm1_p75qgxMFxSPjW7i7iRQTQ&ctype=5&q=&ved=2ahUKEwjjzr_K-6n_AhW8D1kFHWrVAZQQwg8oAHoECAQQWQ&adurl= https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEw... Or this https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwik3MfK-6n_AhWP4MgKHXMZCx4YABAyGgJxdQ&ae=2&ohost=www.google.com&cid=CAASJORoORmc6Lx2P_fsJtlT62tStHVd5wY0yzZQ_c5eueMg6zeeZA&sig=AOD64_0jaxW__4YzIVKIJAyFatEogufXKA&ctype=5&q=&ved=2ahUKEwjjzr_K-6n_AhW8D1kFHWrVAZQQwg8oAHoECAQQZw&adurl= https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEw... Seem best for the imagined workflow In my mind. Though the cheap option would be a wooden crate.