Where can one find 2.5 inch floppy disks, and other odd sizes

I know this is a strange request for help, but I have done a lot of searching for sources of odd sized floppy disks, and haven't had much luck. The 8" disks are not so much a problem, but from what I can tell, there were 2.0, 2.5, 2.8, 3.0, 3.25, and 4.0 inch formats and finding even one example has become a challenge for me. Since 3" disks were popular with the Sinclair systems, these can be had off Ebay, but what of the rest? Its a personal quest to one one copy of every type of removable media and if anyone has any ideas, sources, information, it would be most appreciated. I hope to post the collection to a website as I don't think it has been done. Thanks for any input Kurt (Still seeking a copy of the manual for the Jupiter Ace 4000, but I am hopeful as there is one possible source if I am lucky)