Help!

I have accidentally rediscovered Daedalus Books, seller of remaindered books and publisher's overstock. (I wonder why the catalogs stopped coming after so many years?) If I'm not careful, I could easily find myself spending far too much money there — even if most of the books I want are only $4.98, such as this one, which seems to have sold out in the hour-and-a-half since I first looked at it this morning. (That's the thing about ordering from Daedalus Books. You have to think fast.)