Nuclear is the most regulated: True. Accidents in nuclear have the most consequence, by far, of any generation source.

I would imagine that if we’re just going for disposal, solar and wind are still pretty cheap. With zero recycling wind turbine blades can just be buried after their 25 year life cycle. source.

Same landfill disposal option is available for solar panels at $1 to $5 per panel. source

This would be the level of disposal nuclear has, except low and high level nuclear waste is much more costly and potentially destructive even after disposal.