as far as 800k floppies go, there are two solutions you can try other than obtaining actual 800k floppies.

first and the most temporary (has about a 50% success rate) is to tape over the hole opposite the lock hole on a 1.44mb floppy and format it as double sided.

the other method is to find some 720k pc floppies and format as 800k. this has a higher success rate.