Salco makes the Blue Streak Staple – you can order online at http://www.stapleheadquarters.com/blue-streak-staples.html
PES has them cheaper than direct -- http://www.bindery.com/pfs/partssupplies/stapstch/index.html $4.65/box for 210/6 EBS which we use in our sprint 3000 bookletmaker.
Johnson Stapler Repair has EBS staples available online now for $3.95 per box of 5,000 - http://www.johnsonstapler.com/product/210/6EBS