It was
The Complete Financial Guide for Young Couples, by Larry Burkett. It's technically a Christian book (being given to us by my mother-in-law, it would have to be,) but all that really means is that about every 10 pages or so there's a Bible passage to point out, "And hey! Everything I'm saying is Biblical too!" It's pretty easy to tune out. The guy is a professional financial advisor and has written several books on it. We got one of his teen books for my stepdaughter to work through this summer.