Humble Bundle is offering a selection of Modiphius' Star Trek Adventures RPG books for the next couple of weeks. I've already got the core book, and the Delta Quadrant expansion isn't included, so this is a maybe for me, but it's a decent price for the lot.
15 bucks for everything included is a steal! I've wanted to dabble in this RPG, but the cost of the books put me off. Glad I can check out a huge chunk of it now, for less than the cost of the digital version of the core rulebook!