Were to buy (Haliotis asinina) Asses Ear Abalone?

[Foster]

About 2 years ago I was givin an asses ear abalone (Haliotis asinina) which turned out to be an excelent grazer in my tank, and is still kicken today. I would like to add another one, but have never seen them for sale? Anyone know of an online retailer that sells them?

Thanks