I've built https://confidentialinference.net/ to make it easy for myself (and others) to explore which confidential inference providers exist and more importantly which models are available and how much they cost.
The pricing varies significantly across providers as you can see on https://confidentialinference.net/models.
Data collection is semi-automated as some providers make it very hard to find the information at all, let alone pull it automatically. If anyone knows of any other provider that isn't on the list let me know.