I just sent my three bridesmaids their cards and little gift to ask them to stand up at my wedding. I got the cards from Etsy seller SDezigns (I think I saw someone on here who had these same cards), and she was really easy to work with and quick. She also offered some discounts on future orders.
I got the necklaces from Overstock Silver for $20/ea, printed up a little card with the meaning of the starfish, and voila! :-)