Lillian Vernon, which is a catelog company also has them. They are with the kids luggage and school supplies. They will also personalize them. I had them just put the kids initials on them, since I didn't want to have their names out for everyone to see (you know, come here Kaylie, your mom said I should bring you to her???)
I also had the problem with the straps being too big. I got them fanny packs when the kids were 3 1/2 and 5, and they had to be taped down. They are now 8 1/2 and 10, and they are still too big, but the tape is holding up fine!