I'm looking at buying Math Mammoth, particularly with the group sale, and thinking ahead to printing. We do have a laser printer, which is obviously much more economical than an inkjet in terms of ink, but I'm wondering if anyone who uses it just prints their own pages or has a service do them. What do you spend on a year's worth of MM pages? Do you just keep the pages loose or put them in a 3-ring binder or get a year's worth spiral-bound? I'm wondering if I printed every page in advance if that would be overkill, or if the kids usually do them all. Any suggestions on the daily ins and outs of this program?