If you are looking for a Slackware version on floppies, on the Slackware ftp server are older versions of Slackware. Several versions are still floppy sets. Several mirrors have them to.
You can recognize these listing the slakware dir of that version which have numbered disks, like a1, a2 etc.
And since you are not using the machine on a network or Internet connection it's not really that important that those versions are probably a security nightmare.
Good luck with them
/edit: Looks like 7.1 was the last version to support a 100% floppy install.