Ok first post, and I know there have been a few NY flight deals recently so I'm taking a risk, but I did search and have not seen this. And as someone who missed the very low 245 return deal with BA and was trying to find an alternative, I just though I would help out in case others were also in the same boat ;-)
On my search for another deal that ran through the summer period I noticed that Airline Network have return Virgin flights listed for as low as 305 ukp in July, whch I think is quite hot given that Virgin still have them at 585.
Expedia also have them listed as special fares, but at 345 pounds. However their packages for hotels work out cheaper than Airline Network so overlal could turn out to be less if thats what you are after. Either way though still quite good deal I think.