Jones Insertable Tabs for $0.89 shipped through Amazon. You can get free shipping when you have an Amazon Prime account.
If you are looking for all of the items to set up your own binder, here are some other items you might want to check out:
■Zipper Binders – As Low as $12.99 shipped
■Baseball Card Sleeves – As low as $5.95 shipped for a 25 count or $14.99 for 100 count
I got all of my baseball card holders for about $.05/page on Ebay.