Looking For #1 Glassines With Triangular Flap

The title about says it all. I'd like to but about 500 of them, maybe more. Recently all I've been able to find are the #1 size glassine envelopes with narrow rectangular flaps that run the width of the envelope. I like to old triangular style better but they are hard to track down. Any ideas? Jim

Per 100:

https://www.globalstamps.com/glassi...backing-slip

https://centurystamps.com/glassine-...no-1-pk-100/

Per 1000 (box)
This is a good dealer:
https://www.gvstamps.com/cgi/displa..._num=GL1-BOX


Google is your friend.

WOW - Glassine envelopes are over 7 cents each , on top of 3 cents per hinge . This is all on top of the Italian Scott Album I got for $35.00 in 1977 ,that now cost over $300.00 . That is nothing compared to the complete set of Greece albums , that are being sold for $1,000 came to me in a Worldwide bulk lot .

This is getting expensive .we all can see all those lots at stamp auction which sell 5 red boxes of stamp for $350.00 and when you look at it ,your buying the glassines at that price ,the stamps and the cardboard boxes are free or just coming as a bonus .