I haven't kept good enough records since I started doing this, but my general sense is that while my per-book costs have definitely gone down, the number of books purchased has gone way up. I DO know my overall spending has gone up since it goes to a credit card. I also don't check as many hardcopy books out of the library anymore (there are tighter limits on the number of ebooks you can check out of the library (4-10); I've had upwards of 40 hardcopy books from the library out at the same time).
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