Ask HN: What's the best way to spend $2500 on Machine Learning content?

Employer has allocated $2500 for learning that expires end of the year. Here's my current plan - can anyone suggest a better way to spend the remaining $1150?

Spent:

  $999 - Udacity's Deep Learning Nanodegree
  $345 - Python and career-related books

  $999 - Udacity's Deep Reinforcement Learning Nanodegree
  $49 - Coursera's Deep Learning specialization
  $100 - more books