I was using Amazon to find paper and I thought we could collaborate sharing links. Links to origami accessories would be appreciated too. Off course you can find many options in Origami Shop If you add a link, please say whether you have used the item and perhaps share with us your experiences.
Paper
I was planning to buy some mulberry paper and I found
this. 9 x 12 inches (22.9 x 20.5 cm). Perhaps a bit small.

I am planning to buy non-bleeding tissue paper and I found this one. I did ask previous buyers and one of them tried whether it was non-bleeding. He said that it is mostly non-bleeding. Do you have a brand you trust?

Steingar uses 15 x 15 cm (6 x 6 inches) Aitoh paper.
Accessories
Methocel. Pure methylcellulose. I do use it to treat paper.

Elmer's methylcellulose. Baltorigamist uses it.

Lyneco methylcellulose. OrigamiasaEnthusiast used it.
Last meaningful edit on the 4th of June 2020