The online search went from a price comparison with the result "so that was a good price after all and no shipping costs" onto "how can I make one"?
We found a Dynomighty airmail print Tyvek Mighty Wallet at Goose last Saturday. It was coveted by someone who likes lightweight small wallets and doesn't carry coins.
Tyvek is an untearable (no guarantee) plastic sheet and I had five A3 sheets in my stash. The YouTube search revealed a tutorial using a Tyvek shipping envelope by the man who designed Mighty Wallets, by someone who copied the wallet and another alternative paper origami design, possibly designed by Sok Song.
As the A3 sheets were a bit short for the project (one bank note pocket not two) I made my version and then tried the origami version.
I went onto create a style and size that could be created from 12 in x 12 in scrapbook paper. These won't last forever but would be good for giving gift cards for Christmas or birthdays.
There is a bank note pocket and two gift card/credit card pockets. Either could be used for a greeting.
This design needs paper approx 15.5 in x 13 in so I used a sheet of KaiserCraft wrapping paper. It also has a nice fine fabric like texture. The down side is that there is a part of the wallet that shows the back of the paper, in this case white.
There is one pocket for bank notes and four places that could hold gift cards or credit cards.
edit: I have added a post with YouTube link on how to make this wallet here.