Updated October 5, 2018: All Trollhalla Press PDF items are free for what should be the rest of October 2018 – DriveThru RPG (DTRPG): https://www.drivethrurpg.com/browse/pub/9559/Trollhalla-Press?term=trollhall&test_epoch=0 (not an affiliate link) and on RPGNow: https://www.rpgnow.com/browse/pub/9559/Trollhalla-Press?term=Trollhalla&test_epoch=0 (not an affiliate link). You don’t have to buy one of the Tunnels and Trolls Bundle of Holding to get the free PDFs on DTRPG or RPGNow. You don’t need to order on both as RPGNow is part of the DriveThru RPG family. One of the free downloads includes the Solo Rules for Tunnels and Trolls. It is not the full set of rules, but if you go with the Tunnels and Trolls Bundle of Holding: https://bundleofholding.com/presents/TunnelsAndTrolls, the Gamemaster Collection (currently at $19.30) includes the Deluxe Tunnels and Trolls Rulebook (DT&T). For the Fairy Spell Book, choose the PDF only when it takes you to it.
I added a new blog post, All Trollhalla Press PDFs Free Through the End of October, now that I have more details on the special deal. As of now, Ken indicated if the Tunnels and Trolls Bundle of Holding gets 1,000+ subscribers, he would set his Trollhalla Press PDFs to free for the rest of October 2018. He closed the Trollhalla Press website a while back: https://trollhallapress.wordpress.com/2015/12/13/ken-st-andres-tunnels-trolls-store/ for print copies. He does offer PDF versions on DriveThru RPG and RPGNow – see links below for Trollhalla Press.
If you followed my blog posts: https://upsdownsfamilyhistory.wordpress.com/2018/10/01/gaming-sunday-week-of-september-30-2018/ or Bundle of Holding – Tunnels and Trolls RPG Bundles, there is a new development that was announced recently. In the Facebook Group Trollhallans – https://www.facebook.com/groups/876448375868280/, as well on Ken St. Andre’s Facebook profile, Ken mentioned a special deal for October if the Tunnels and Trolls Bundle of Holding – https://bundleofholding.com/presents/TunnelsAndTrolls deal hit 1,000 subscribers. It achieved that level over an hour ago.
More about Ken St. Andre can be found on Wikipedia: https://en.wikipedia.org/wiki/Ken_St._Andre. Some of his work includes the Tunnels and Trolls RPG, Here are some additional URLs for Ken: https://web.archive.org/web/20070927183704/http://www.sff.net/people/ken.st.andre/, https://delvers.wordpress.com/, https://atroll.wordpress.com/, http://www.isfdb.org/cgi-bin/ea.cgi?Ken_St._Andre, https://www.facebook.com/groups/876448375868280/ Trollhallans Facebook group; Trollhalla Press on DriveThru RPG (DTRPG): https://www.drivethrurpg.com/browse/pub/9559/Trollhalla-Press?term=trollhall&test_epoch=0 (not an affiliate link) and on RPGNow: https://www.rpgnow.com/browse/pub/9559/Trollhalla-Press?term=Trollhalla&test_epoch=0.
If you want print copies of Tunnels and Trolls, you can find them on Flying Buffalo: http://www.flyingbuffalo.com/tandt.htm. For PDF copies, you can find them on DTRPG: https://www.drivethrurpg.com/browse/pub/2238/Flying-Buffalo or RGPNow (which is part of the DTRPG family): https://www.rpgnow.com/browse/pub/2238/Flying-Buffalo.