Drew Johnson the Washington Times reporter says knows of two.
https://mobile.twitter.com/Drews_Views/status/713222276875812865
And not only that..Drew says that it all started with the Rubio campaign. Search twitter #TheThing scroll down to March 10-13. It was a StompTrump effort. Rubio people were hoping to knock both out for Super Tuesday. The abandoned it when Rubio lost and pulled out. A story was in the works with a major online media (breitbart) but it never ran due to editing problems (and maybe Ben Shapiro a Cruz supporter)
Dear Texas- Don't vote for #Cruz. If he loses TX, he gets out & #Rubio has a head-to-head with #Trump. That's the only way Trump could lose.— Drew Johnson (@Drews_Views) February 26, 2016