I bought two Amazon deals in September for a total of $3, bringing my YTD totals to 17 books for $22.25 cash outlay.
It's obvious to me that Kobo coupons drove a lot of my buying, but my habits have changed a lot, also. I'm much more resistant to Amazon deals. And in general, when I run across a book I like, I'm content to put it on my wishlist and let it go, instead of immediately searching for my cheapest option. I keep winnowing my wishlist as wants become less pressing; eventually I'll pick up some if they go on sale or with funny money or, since at this point I think it would be reasonable, if I really want to read it. This doesn't have to be a hairshirt.
I'm lucky in that I'm not following any authors or series in particular, so I lack that (entirely understandable) urge to get the next book as it comes out. Obviously there's enough on my TBR (to which I can't put a number) that I can shop there for my next read.
I got over freebies long ago; it was harder for me to resist the daily deals. Similarly, I gladly purged my library of free books (which was a salutary lesson in itself), but I find it harder to get rid of books that I bought for $1.99, say, but that realistically I'll never get to. I know, they're doing no real harm, but virtual clutter irritates me and it's one reason I can't enumerate my TBR (aside from not wanting to
); there's no point in counting a book I'll never feel like reading and having paid for a book is not sufficient justification for wasting good reading time on it after having already wasted money.
My TBR melts at a glacial pace; I'm not buying much anymore but between audiobooks, OverDrive and public domain a lot of what I read doesn't count against it.