I want to know the details regarding low cost fee universities offering LLM in US and UK

What is your overall budget?

For the best schools like Columbia, Virginia, etc. the tuition is generally in the $60 -70k+ range.

The next tier down - programs like at Miami or Pepperdine etc. you're looking at $50k+.

Below that you start to see some good values: University of Florida, Washington - Seattle in this range is under $40k.

The schools that are more locally oriented and have less standing in the rankings, think University of Baltimore, University of Iowa, etc. are $20k+.

Depends on your budget and your goals, honestly.