Baensch Aquarium Atlas 2 for $10!
Not sure if this is common to all Barnes and Nobles, but I went to a smaller one at the local mall yesterday and found this sizable "half-book" on sale for $9.98. States that the original price was ~$60. The first 170 pages are on plants, with every other page typically showing three plants along with an algae section. On a first glance, the pictures are nice and the data seems pretty current. Then there's also close to 1000 pages on fish species with 2-3 pictures every other page.
Can't say I had been looking for the book, but a real deal at $10.
Because the Manga section wasn't big enough and my daughter had a gift certificate burning a hole in her pocket, we did then head out to a bigger self-standing B&N store. I saw many of the same 'Bargain Books' at the bigger store, but didn't note the atlas. So, YMMV.