Do you have 5.25" and 8" floppy disks that are spare, low-quality, degrading, or just generally in bad shape?

I'd like to take my floppy disk data recovery game to the next level. I have equipment, but there's no substitute for experience. Therefore I'm looking for loose collections of old floppy disks to practice on. I'm especially interested in working with disks where the binder affixing the media to the donut is starting to fail.

I'm in London; will pay shipping; can pick up disks around here as well. Boosts are appreciated!