While we have a decent number of Penny Dreadfuls in Fales, we have a massive collection of Dime Novels. Back in the 1960s, Mr. Edward G. Levy donated an exceptional collection of Dime Novels to NYU. The finding aid to his collection is (at long last) available online at this address:
http://dlib.nyu.edu/findingaids/html/fales/levy.html
Unlike the term "Penny Dreadful," American Dime Novels were advertised as such. For instance:

Malaeska (1860), by Ann Stephens, is the first Dime Novel. It was number 1 in what would become a long series of Dime Novels published by the firm of Beadle and Adams under the "Beadle's Dime Novels" banner. If you really want to know more about Beadle & Adams, take a look at The House of Beadle and Adams and its dime and nickel novels; the story of a vanished literature by Albert Johannsen. It's three solid volumes of mind-numbing detail.
Here's a later title in the series:

And here's the back cover of another:

One notable point of difference between American Dime Novels and the English Penny Dreadfuls is that the Dimes are not serialized. The top right corner of Malaeska informs the buyer that this work is "Complete." Beadle's offered a new number in its Dime Novel series every month, but each number was a complete novel.
The other difference is subject matter. Instead of the sordid underbelly of London, Dime Novels generally featured adventures in the American West. Here's another fine illustrated cover:

It's not published by Beadle, it didn't cost a dime (fifteen cents for this one), but I'd still call this a dime novel. Notice that this one is also complete and part of a series. TWO series, actually.
Just as I've been doing with the Penny Dreadfuls, I'm working on adding the Genre/Form heading "Dime novels" to the BobCat records for our holdings. Because the bulk of our dimes are in the Levy Collection, they won't all show up in BobCat. Go straight to the Levy finding aid if you're keen to get your hands on the goods.
Of course, you'll also find heaps of British material in Levy too. Actually, there are some great runs of Story Papers in Levy, but that's another subject altogether.
Coming up next: Sir Walter Scott!