Sells tweets on Fiverr or Sponsored Tweets.
But come on... who are you fooling 150K... if these are real and responsive followers, what's the market segment? How did you get them? If you already new the answer to these questions, and these were real followers, you wouldn't be asking what to do with them.
But just for sake of argument, if they are your genuine followers and interested in what you have to say, you can direct them to any affiliate product, any squeeze page, any CPA offer. Just presell them on how cool the shit is, and how much they're going to love it.