[confluence]

This is the crux of negotiating. The person with more options has more power. There's really only one way to get a raise: pay me X or I walk. If yay, good, if nay, walk.

[semi-extrinsic]

A subtle way to reinforce your words is drawing on the famous million-dollar Amdahl coffee cup:

http://dealwhisperers.blogspot.com/2015/07/a-million-dollar-...

In this case, find a friend at Google/Apple/whatever and ask them if you can have some employee-only branded stuff.