Casa announced two new multi-sig security producs to everyone.

https://www.theblockcrypto.com/2019/02/28/casa-is-dramatically-shifting-its-business-and-its-kicking-off-with-two-new-products/
https://blog.keys.casa/multisig-security-for-everyone-keymaster/
very expensive. 
https://www.theblockcrypto.com/2019/02/28/casa-is-dramatically-shifting-its-business-and-its-kicking-off-with-two-new-products/
https://blog.keys.casa/multisig-security-for-everyone-keymaster/

You can do almost the same thing for free by using the Split Wallet feature of bitaddress.org and sending one key to someone else.
Key word is: almost.
Casa offers more exclusive security services for all kinds of people with small to big pockets.