I have actually broken down and bought new workbooks a few times (online or at the Learning Palace), like last year, when Kendall was learning about the 50 states we bought a workbook with a page or two for each state that had trivia and little activities. It was a lot easier to buy that workbook than try to make up my own lesson for all 50 states! I guess I just "pick my battles".
As for textbooks, I've never purchased them (until recently when I had to because the subject matter was out of my 'wheelhouse'). I almost always find whatever I need online for free, or if I really need a book (or video) I find something appropriate at the library or online.
One of my "things" (quirks?) is that I have a prejudice against pre-packaged curriculum. I'm probably over-paranoid about it, but I don't like unnecessary busy- work and the curriculum sets I've seen are full of it! I remember being bored to death in school because the students who were behind got most of the instruction and the rest of us got a lot of pointless busy work. Silly, pointless things (like connect-the-dots coloring pages, which are great for younger kids, but not exactly appropriate schoolwork for 5th graders!). One of the reasons I wanted to homeschool was that I could cut out that sort of thing and stick to the topics that matter. That way I can supplement additional info if I want, or move ahead to new material as soon as the student is ready