I have a matching set of the five released Expanse novels up to date, with the sixth novel on preorder.
As an aside, as 'flipping' goes I'm not making tons on them at this price. Retail for them was 2100 and when I consider that I paid 1k for the first book when it was on preorder... I'm not doing great on them at this price but eh, what can ya do? Guess I'm making $400?