Most people forget their public library has gone digital. Apps like Libby (powered by OverDrive) and Hoopla allow you to borrow audiobooks using your library card.
Pro Tip: If your local library doesn’t have it, some major libraries (like the Brooklyn Public Library or Los Angeles Public Library) offer non-resident digital cards for a small annual fee (often $20-50). That’s still cheaper than buying the trilogy outright. eisenhorn: omnibus free online audiobook
If you are looking to listen to the Eisenhorn saga without paying an upfront per-book fee, there are legitimate, high-quality avenues that support the creators. Most people forget their public library has gone digital
Games Workshop frequently partners with Humble Bundle. Every few months, a "Warhammer 40,000 Audiobook Bundle" appears. Pro Tip: If your local library doesn’t have