I know lane cove comes in 30 ml unicorn bottles. Also one hit wonder's two juices muffin man and milk man come in a 180 ml bottle along with 2 empty 15 ml unicorn bottles.
As a store, we looked at the unicorn bottles and decided against them. But we do keep some around for our customers that have arthritis and/or prefer the softer bottle. It might be worth asking your vendor.