Speaking of those deals, I succumbed to my first real "this is now one of those things we
shouldn't do" buy just now - bought a book I'd never heard of before, after three online friends all mentioned they were reading and loving it, and it was $1.99 just now, and it sounded potentially interesting (and not in my usual genres, so good for that "reading some books outside my comfort zone" challenge), so...
Still. It's 23 January and I'm up to eight books bought, only one of which was (just) over $2. So far, I'm still within the limits of my "ten books a month / 120 books a year / definitely spending no more than $50 a month" challenge.