We hit a couple library sales as well: one in Belmont, the other in Burlington. Both were bag sales, which usually occur at the end of the weekend. Most notable for me were the first three from the series of Rabbi Small mysteries, some armed services editions of James Thurber stories and a couple cookbooks. Pavel got some books on programming and mathematics, and favorite book by someone he's a huge fan of.
Nothing really spectacular like what I found a couple weeks ago in Acton, but still nice.