The World Bank has a great resource here which lists out pricing for emissions trading systems (ETS) and carbon tax by country.[0] (Map & Data > Price > Type of Instrument). Highest carbon taxes are $100+ / ton (Sweden, Switzerland, Lichenstein), high initial value for trade is about $50 (EU, Switzerland).

We are a bit behind in the US in credits or taxes, we are now treating the social cost at $51, but not using that for tax or trade policy.[1]

There's one more number that is useful to get a numerical sense of the costs: $258 / ton, an estimate of the actual cost to society. [2]

[0] https://carbonpricingdashboard.worldbank.org/map_data [1] https://www.scientificamerican.com/article/cost-of-carbon-po... [2] https://www.nature.com/articles/s41467-021-24487-w