Whatever it is, it can be found at the Papermania show.

http://we-ha.com/papermania-plus-show-still-going-strong-40-years

We have collection protection supplies for all kinds of paper ephemera. If there is a need for a storage or protective sleeve we can make it, since we have designed and manufactured almost all lines of supplies we carry. We stock supplies for items as common as magazines or newspapers and obscure as supplies for old billheads and stock certificates that are collected for their beautiful artwork. Visit us at https://www.bagsunlimited.com/