Cheapest alternative is to purchase a few chocolate chip starfish and keep them in your sump if you have one. Then you can cut an arm or piece of it from a different starfish...i dont know how fast starfish regrow thier body parts....you can get them for $8 each at live aquaria.
Good Luck, btw I see at my lfs thier fed starfish, some kind of white starfish, probably they buy it from a market of some kind for cheap prices.
Good Luck, btw I see at my lfs thier fed starfish, some kind of white starfish, probably they buy it from a market of some kind for cheap prices.