I do think that Singapore Math has a problem-solving focus, which is of course good. It's just that the way they illustrate some of the concepts seems suboptimal to me. But there's a long way between "poor" and "suboptimal".
Unfortunately, I don't know much about other curriculums, and have never heard of Real Math. I've read some bad things about Saxon Math, but don't know how accurate they are.
The cheapest place I found to order the Singapore Math "Standards Edition" (apparently made for use in California, with extra coverage on certain topics and using the US units of measure) was christianbook.com . We are not religious, but it is a decent place to order from. We got free shipping by calling for a special code.
jack'smom, for "drill and kill" that's not too boring I would check out IXL. My son used it for a while and found it fun enough to keep going. We haven't used it in a while now, so I may terminate our subscription, though it's pretty cheap at $8/month. You can try it for free up to a certain number of questions per day.
