If you've ever wanted to try Starfinder (the sci-fi sibling of D&D rival Pathfinder), there's probably not going to be a better chance than this; you can get $400-worth of PDF books for just $45 / £35.96. Frankly, it's a bit ridiculous.
Up for grabs through Humble Bundle, this Starfinder offer is available in four tiers starting at $5 / £3.99. The basic level gets you everything you need to start playing (PDF versions of the Core Rulebook, Beginner Box, Alien Archive, Character Folio, and an Adventure Path), but paying more gets you all of the above along with bonus adventures, sourcebooks, maps, and pawns. Seeing as Starfinder ranks on our list of the best tabletop RPGs alongside D&D, I've got no trouble recommending this deal - especially considering the price. In fact, the last time we saw a discount this good was with the Pathfinder equivalent earlier this year.
As per that sale, a portion of the proceeds here (it's up to you how much) will go toward The Trevor Project, an initiative to help end suicide among LGBTQ young people.
You can see the details on each tier below.
Wondering whether you'll gel with Starfinder? Although it's a little denser than the likes of Dungeons and Dragons books, this provides it with more depth overall and an abundance of character options that'll make your head spin. As a fun aside, it's also set in the same universe as Pathfinder, only hundreds of years in the future. That means classic orcs, elves, goblins, and dwarves show up alongside science fiction-inspired species.
You can create any kind of story using its systems as well, so it's ideal if you're hoping to take your players on a grand sci-fi adventure that isn't tied to a major IP like Alien: The Roleplaying Game or Star Wars. It's very well supported by publisher Paizo too with a wide variety of adventures, meaning you'll have plenty of extra material to work through if you enjoy what you see - it's been going strong since 2017.
This offer ends on May 22, so you've at least got a bit of time to think it over if you aren't sold right away.
For more recommendations, be sure to check out the best board games, must-have board games for adults, and these essential board games for 2 players.