A 24 steel door does not have to be difficult to find. 24 steel doors are available in various styles. You can find 24 security steel doors, 24 stainless steel doors as well as 24 exterior steel doors among other products. A reliable steel door can really improve security. There are many different types of steel doors available such as steel glass doors, steel sliding doors, stainless steel doors as well as steel front doors, so you won't have a trouble finding one that suits your needs.
Vestal 32" x 24" Steel Crawlspace Door
"32x24 crawlspace door. Built on lintel. Lockable
ProSteel 36" 6-Panel Steel Door with Left Hand Opening
"Ready-to-install door with frame. Compression weatherstripping. Limited lifetime warranty"
These doors can be found at lowes.com