R.e. your question: no there isn't.
Even if you don't have anything in dirtmouth to buy right now, there will be more uses for geo than you have access to eventually if you try and go for absolutely everything, so try not to be too careless with it if you can help it.
Thanks. But of a ballache, but I guess it adds to the tension of playing! My daughter was watching me play earlier and she said she both loves it and hates it because it's such a stressful game!
Huh? You cannot spend money there, it's the other way round: you sell relics to get more Geo. He's in the city of tears, near the entrance to the sewers.
Have you found the fountain in the ancient basin yet? I used my Geo on that until I had a new goal to save money for.
Sorry, I meant the charm shop, not the relic shop. Got them mixed up. I remember where the charm shop is (just been on the wiki) so I'll head over there and buy a few more.
Edit - no, I have not been to the Ancient Basin yet I don't think.