Hopefully Massdrop can organize something with Akkerman. They are only sold from their shop in the Netherlands and their bottles are famous for their design. It's a long necked bottle with two chambers. The smaller chamber has a marble in there, creating a valve that provides a convenient place to fill a fountain pen. Many people order these just for the bottles, the fact it has a 150ml of ink is just a bonus. There are a few group orders that start up on FPN, but one big one handled by Massdrop would probably be the least messiest way of doing this.