Indrajaal - Indrajaal is very rare and of great importance. Indrajaal can not be found easily and can not be imitated also. It's importance are mentioned in scriptures like Daawaratantra, Vishwasaara, Raavana Samhitaa etc. Indrajaal gives many benefits to a person if he keeps it in his house of worship (Puja Ghar) getting it tied in a sacred piece of cloth after worshiping it.
Indrajaal is also filled in talismans. In scientific language , its known as Sea fan. These are genuine products available for cheap and can prove very beneficial. One is not allowed to sell these, as these are banned by wildlife authorities in India.