The phrase 'extra thank you' is correct and usable in written English.
You can use it to express extra appreciation for something. For example, "Our teacher put in extra effort to make our class enjoyable, so an extra thank you is due."
"It is obvious their aim is to give their residents the best possible experience," writes Marion C. Vicki L says: "An extra thank you to Carol-Lynn for her help, which went above and beyond the call of duty".
That's $1,410 extra, thank you, but when combined with the standard aluminum dash trim, the leather wrapped tilt/telescope steering wheel, the electric windows and dual-zone climate control, among other standard features, leather gives a luxe touch to this car that most drivers would want.
And an extra thank you to those who explained who that awful Linda lady was from the season finale.
The reason why women often seem to favor a "softer" communication style is clear: research shows that authoritative women are viewed less favorably than men, an extra "thank you" or "sorry" in an email may buffer against accusations that a woman is "shrill" or "pushy".
An extra special thank you to our three boys, we are so proud of you.
And as an extra special thank you to fans, a total of ten Golden Keys will be hidden in the Deluxe and Super Deluxe DVDs for fans.
Extra special thank you to Alan Fox and Family, Kevin Prior and Raegan Hillman, Levi Strauss & Co., and the Lakeshore Foundation for believing in The Pollination Project and our global network of early stage social change-makers.
That's worth an extra thank-you to Dean because not enough people think about the right thing to do anymore.
And an extra thank-you as well to the lawmakers in Washington for holding the steroid hearings, which was also the right thing to do.
And it might even make sense for someone to suggest we all pay an extra $20 "thank you tax" to our nation's Army and Marine Corps this year to replace some of the equipment those soldiers and Marines have used in Iraq and Afghanistan while most of the rest of us have sat on the couch eating Cheetos and worrying about the NFL lock-out.
But Bieber fans will notice something extra special about this thank you letter - the impressive number of references to the 21-year-old's hits.
