There is good data on prices at this web sit
Right column.

http://tonto.eia.doe.gov/dnav/ng/ng_pri_sum_dcu_nus_m.htm

Here's another useful set of price data:

http://www.oilnergy.com/1gnymex.htm

BTW, given the infrastructure costs of LNG production and delivery, I don't see how it can be landed for less than $7/mmBTU:

http://www.energypulse.net/centers/article/article_display.cfm?a_id=623

redundant and so deleted. Joe