Ebay offers CBG Card Saver Large Semi Rigid PSA Grading Submission Holders 200-Pack for $17.98 (reg $89.99) with free shipping.

Product Description:
Card Saver 1's are your best option for graded card submissions. They are the only card holder that is recommended by PSA and BGS by name. These are semi-rigid card holders that fit all standard sized trading cards and some over-sized cards. Card Saver 1's are sealed 50ct packages. They are archival safe and have been made exclusively by Cardboard Gold. All other brands are cheap knock offs.