are you talking about the ones to hang hammocks or toys??? i need them too and havent been able to find them. was gonna check AC Moore today maybe in the jewelery section.
Not sure how expensive lanyard hooks are, but another option is ring clips - you can get them at Staples... though I don't know how economical they'd be if you're looking to "mass produce" what you're making.
If you are talking about eyelets to make a place for the lanyard/pear clip/curtain hanger to attach to, they are available in the sewing section at Michaels. They have a cheap eyelet setter and large eyelets that are perfect for that ).