The phrase "deal newsletter" refers to a regular publication or email that provides information about current promotions, discounts or special offers from a particular business, store or company. Full definition
You won't go wrong using what you learn in that article for your ads in other deal newsletters, too. (buildbookbuzz.com)
In 2012, they launched BookBub, a daily deal newsletter for ebooks. (mashable.com)
I * can * say, though, that advertising in a magazine is different from advertising in a daily deal newsletter for booklovers like BookBub — you can't compare the 2. (buildbookbuzz.com)