I listened to Between Two Cairns podcast episode for The Cairnies 2025. Ranked them based on votes. Scoring is like for F1 race scoring for top 5 finishers but 1/10 the points. Tie breaks go to cheapest product.

1. The Frozen Ascent ($6) [4.5 points]
2. The Horrendous Hounds of Hendenburgh (£15) [4.3 points]
3. Grotto of the Golden Gargoyle (AUD $4) [2.7 points]
4. The Smoking Pillar of Lan Yu (free) [2.5 points]
5. The Ghosts of Zoazanna Mountain ($30) [2.5 points]
6. Arkos ($15) [1.5 points]
7. Fragments of the Floating City (PWYW) [1.2 points]
8. Kidnap the Archpriest ($7) [1.2 points]
9. Buried in the Bahamas ($8) [1.0 points]
10. Ex Inferis ($8) [1.0 points]
11. The Evils of Illmire ($10) [1.0 points]

I was thinking I could run one after my PCs finish X1/X2 -- they'll probably level 6-7. But most of the adventures are for low level characters (up to level 4). Except these three:

Arkos - science/fantasy Troika adventure so I'd be doing this on the fly and Troika is not heavy combat I think.

Kidnap the Archpriest - A systemless adventure that seems to be more about talking, interacting, and figuring things out than fighting.

Ex Infernis - Liminal Horror set in modern day abandoned research ship on the Great Lakes. Probably too hard to adapt well.

Although none of these are appropriate enough Arkos seems the most interesting.