> Britiany Peel & Stick Floral Roll by Canora Grey

> From$1.20/sq. ft.

https://www.ehd.org/science_technology_largenumbers.php

> The area covered by 100 one dollar bills measures 11.13 square feet.

comes out to about $9/sq. ft., about 9 times as expensive.

But 1USD=90RUB today, and the lowest denominated note is 5RUB, coming out to 1USD=18notes. Each note is 137 mm × 61 mm, coming out to about 0.09 sq. ft. (if I'm not mistaken). Then 1USD=1.62 RUB sq. ft., so it costs

$0.62/sq. ft.

to have a green wall of ~~current~~ obsolete Russian currency.

What's surprising is that you can afford it even if you live in Russia. According to Obi and this roll of wallpaper:

https://oboi-store.ru/catalog/bumazhnye

> JB80201 Обои KT Exclusive Jelly Beans

> 10.05х0.53м

> 10 500 руб/рул.

the price per area isn't that different, coming out to about $2/sq. ft., meaning that if you have a clever way to paste all the single notes easily and know how not to get in any potential trouble with the law, it makes economical sense to get your wallpaper at the bank.

EDIT: according to Wikipedia, the note has been replaced by coins, and the next one is almost but not quite 10x as expensive by area.