I dont see any evidence that this was a large scale effort.

As another poster pointed out as well, these might be affiliate links dropped by a widget like skimlinks,etc...

If only there was a way to check and see if these links were generated by a widget and not actually part of the article's HTML.

Oh wait... there is!

Viewing the source from the "6 of the Most Enjoyable Theme Parks in the Nation" [1] article referenced in the parent article shows that the phrase "guaranteed best price on airfare" indeed is a straight link to Expedia.

[1] - http://www.cheaptravelblog.net/6-of-the-most-enjoyable-theme...

[2] - http://i.imgur.com/gGoo9jL.png

you can use NerdyData to search links like those directly on the sites source code: http://d.vncs.me/T864 [short link, HN mess the full link]

Wow, NerdyData seems like it can be very useful sometimes, thanks for sharing!