This site sells them. I bought 6 in their package deal. But I've never seen any of them since I put them in about 2 months ago.
http://www.ipsf.com/
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Introducing MiniStars tm, our 100% Captive-Bred Hawaiian Reef
Brittle Stars. MiniStars are small, incredibly industrious sand stirrers and cleaners that will help keep your live sand bed healthy, aerobic and free of decomposing detritus - the organic particles that rain down every day from the water column above. These reef-dwelling ophiuroids reproduce readily in closed systems because they have direct development (no planktonic stage). Reef safe, will not bulldoze. Size of individual specimens ranges from approx. 1/4 to 1/2 inch; includes adults, sub-adults and juveniles. MiniStars do not grow larger than approx. 1 inch in diameter. Sold only with the purchase of a SuperSized Mix 'n Match Special. 6 specimens $24.95. (Sorry, no exceptions - quantities are very limited.)Instructions
New! MiniStars Breeding in Boston
Customers Talk About MiniStars (from Aqualink)
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You can go there and scroll down to the above paragraph which I copied from there. Once there you can click on the two links.
Eddie G