What other places have them? If I'm asking DH for some for my birthday, I have to give him more than one choice, or he'll play the "it's not a surprise" card and get me something I didn't ask for instead.
I made my own! Maybe DH would like to make a necklace for you with your oldest. Kids love to make things. It's a great project for a weekend or rainy day. My oldest ds made himself a sibling necklace.
I used hemp string. Make sure that the bead holes are big enough to fit on the string. I went to the craft store and spent about 10 $ and made two necklaces from my materials and had enough to make about two more.
I have tried twice to post a picture of my necklace and couldn't. If you want to see a picture of it you can e-mail me and I will send it along.