You may need to look for 8.27" x 11.69" - https://www.staples.com/hammermill-copy-plus-8-27-x-11-69-copy-paper-20-lbs-92-brightness-500-sheets-ream-105500/produ

You may need to look for 8.27" x 11.69" - https://www.staples.com/hammermill-copy-plus-8-27-x-11-69-copy-paper-20-lbs-92-brightness-500-sheets-ream-105500/product_24448136 https://www.staples.com/hammermill-copy-plus-8-27-x-11-69-co... Or you can buy a ream of legal-size and have a printshop slice it down (which is how I got ahold of B4 or B5 IIRC).