not sure, i imagine in a folder with other cards on top it would supress the curl, but ideally i think we need somthing like the top loader
i did get a couple of replies on twitter
BCW
Ultra Pro
so there a re a few distributor Contacts there we can pass on that might be able to get them in,
Zing also told me to send an email or Message via FB to see if they will stock the supplies, if they get enough requests they may look into it.