cloning ethereum smart contracts might be cheaper soon with EIP 1167
https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1167.md

https://ethereum-magicians.org/t/eip-1167-updated-last-call-period-extended/1046

https://bitcoinexchangeguide.com/ethereum-blockchains-eip-1167-for-minimal-proxy-contract-could-improve-clone-functionality/

https://www.bountysource.com/issues/59913607-eip-1167-minimal-proxy-contract

https://unhashed.com/cryptocurrency-news/ethereum-easier-clone-smart-contracts/